Introduction to Web Development and E-commerce

Emmanuel BRUNO

emmanuel.bruno@univ-tln.fr

Université de Toulon

LIS UMR CNRS 7020

2026-10-05

Web Development for E-commerce

• Web Development:
  • The process of creating and maintaining websites and web applications.
  • Involves a combination of front-end (client-side) and back-end (server-side) development.

Web development is the process of creating and maintaining websites and web applications. It involves both front-end (client-side) and back-end (server-side) development. Front-end development focuses on the visual and interactive aspects of a website, while back-end development handles the server-side logic and database interactions.

• E-commerce Web Development:
  • Focuses specifically on building online stores and platforms for buying and selling products and services.
  • Integrates various functionalities such as product catalogs, shopping carts, payment gateways, and user accounts.

E-commerce web development focuses specifically on building online stores and platforms for buying and selling products and services. It integrates various functionalities such as product catalogs, shopping carts, payment gateways, and user accounts. These features are essential for creating a seamless and secure shopping experience for customers.

E-commerce Models and Technical Examples

B2B (Business-to-Business)

• Businesses sell products or services to other businesses.
• Technical Aspects:
  • Use of APIs for seamless integration with client systems.
  • Secure transactions and data handling.
• Examples:
  • Alibaba: Uses robust search algorithms and data analytics.
  • Amazon Business: Employs scalable cloud infrastructure (AWS).

B2B refers to businesses selling products or services to other businesses. In this model, companies often use APIs for seamless integration with client systems and ensure secure transactions and data handling. For example, Alibaba uses robust search algorithms and data analytics to facilitate B2B transactions, while Amazon Business employs scalable cloud infrastructure (AWS) to support its operations.

B2C (Business-to-Consumer)

• Businesses sell products or services directly to consumers.
• Technical Aspects:
  • User-friendly interfaces and responsive design.
  • Secure payment gateways and personalized recommendations.
• Examples:
  • Amazon: Uses machine learning for personalized recommendations.
  • eBay: Implements real-time bidding systems.

B2C refers to businesses selling products or services directly to consumers. This model emphasizes the need for user-friendly interfaces and responsive design, as well as secure payment gateways and personalized recommendations. For instance, Amazon uses machine learning for personalized recommendations to enhance the shopping experience, and eBay implements real-time bidding systems to facilitate consumer-to-consumer transactions.

C2C (Consumer-to-Consumer)

• Platforms enable consumers to sell to each other.
• Technical Aspects:
  • User authentication and secure payment processing.
  • Rating and review systems to build trust.
• Examples:
  • eBay: Uses auction algorithms and secure payment systems.

C2C platforms enable consumers to sell to each other. These platforms require user authentication and secure payment processing, as well as rating and review systems to build trust among users. For example, eBay uses auction algorithms and secure payment systems to facilitate C2C transactions.

Technical Focus for E-commerce

• User Experience:
  • Ensures that e-commerce sites are user-friendly, visually appealing, and functional across all devices.
  • Leads to higher customer satisfaction and increased sales.

User experience ensures that e-commerce sites are user-friendly, visually appealing, and functional across all devices. A good user experience leads to higher customer satisfaction and increased sales. It involves designing intuitive navigation, fast-loading pages, and responsive layouts that adapt to different screen sizes.

• Performance and Scalability:
  • Optimizes site performance to handle high traffic and large volumes of transactions.
  • Ensures that the platform can scale as the business grows.

Optimizing site performance is crucial for handling high traffic and large volumes of transactions. Scalability ensures that the platform can grow as the business expands. Techniques such as caching, load balancing, and database optimization are used to enhance performance and scalability.

• Security:
  • Implements security measures to protect sensitive customer data and prevent fraud.
  • Ensures compliance with industry standards and regulations.

Implementing security measures is essential to protect sensitive customer data and prevent fraud. Security practices include using HTTPS, encrypting data, and regularly updating software to patch vulnerabilities. Ensuring compliance with industry standards and regulations is also important for maintaining customer trust.

Key Components

• Front-End Development:
  • HTML (HyperText Markup Language): Structures the content of e-commerce websites.
  • CSS (Cascading Style Sheets): Styles the visual presentation of web pages.
  • JavaScript: Adds interactivity and dynamic features to enhance user experience.

Front-end development involves creating the visual and interactive aspects of a website. Key technologies include: - HTML (HyperText Markup Language): Structures the content of e-commerce websites. - CSS (Cascading Style Sheets): Styles the visual presentation of web pages. - JavaScript: Adds interactivity and dynamic features to enhance user experience.

• Back-End Development:
  • Server-Side Languages (e.g., PHP, Node.js): Handle server logic, database interactions, and business processes.
  • Databases (e.g., MySQL, MongoDB): Store and manage product information, user data, and transaction records.
  • APIs (Application Programming Interfaces): Enable integration with third-party services like payment gateways and shipping providers.

Back-end development handles the server-side logic, database interactions, and business processes. Key technologies include: - Server-Side Languages (e.g., PHP, Node.js): Handle server logic and database interactions. - Databases (e.g., MySQL, MongoDB): Store and manage product information, user data, and transaction records. - APIs (Application Programming Interfaces): Enable integration with third-party services like payment gateways and shipping providers.

Why an E-commerce Generalist should know web languages?

• Improved Communication:
  • Understanding web languages helps in better communication with developers and technical teams.
  • Facilitates clearer requirements and more effective collaboration on projects.

Understanding web languages helps in better communication with developers and technical teams. It facilitates clearer requirements and more effective collaboration on projects, ensuring that everyone is on the same page.

• Enhanced Problem-Solving:
  • Ability to identify and troubleshoot basic issues on e-commerce sites.
  • Helps in making informed decisions about website improvements and optimizations.

Having knowledge of web languages enables e-commerce generalists to identify and troubleshoot basic issues on e-commerce sites. This helps in making informed decisions about website improvements and optimizations, leading to a better overall user experience.

• Competitive Advantage:
  • Knowledge of web languages provides a competitive edge in the job market.
  • Enables e-commerce generalists to contribute more effectively to the development and maintenance of online stores.

Knowledge of web languages provides a competitive edge in the job market. It enables e-commerce generalists to contribute more effectively to the development and maintenance of online stores, making them valuable assets to their organizations.

• Better User Experience:
  • Ensures that e-commerce sites are user-friendly, visually appealing, and functional across all devices.
  • Leads to higher customer satisfaction and increased sales.

Ensuring that e-commerce sites are user-friendly, visually appealing, and functional across all devices leads to higher customer satisfaction and increased sales. Understanding web languages helps in achieving these goals by enabling better design and development practices.

History of the World Wide Web (WWW)

• 1989 - Proposal:
  • Tim Berners-Lee proposes the concept of the WWW at CERN.

In 1989, Tim Berners-Lee proposed the concept of the World Wide Web at CERN. This marked the beginning of a revolutionary way to share and access information globally.

• 1990 - First Website:
  • First website (info.cern.ch) created by Tim Berners-Lee.

The first website (info.cern.ch) was created by Tim Berners-Lee in 1990. This site provided information about the World Wide Web project and how to create web pages.

• 1991 - Public Release:
  • WWW made available to the public.

In 1991, the World Wide Web was made available to the public, allowing people to access and share information over the internet.

• 1993 - Mosaic Browser:
  • Mosaic browser released, making the web more accessible.

The Mosaic browser was released in 1993, making the web more accessible to the general public. It was the first browser to display images inline with text, enhancing the user experience.

• 1994 - Netscape Navigator:
  • Netscape Navigator browser launched, popularizing the web.

Netscape Navigator, launched in 1994, quickly became the most popular web browser. It played a significant role in popularizing the web and driving its rapid growth.

• 1995 - Commercialization:
  • Rapid growth of commercial websites (e.g., Amazon, eBay).

The mid-1990s saw the rapid growth of commercial websites, with companies like Amazon and eBay launching their online platforms. This period marked the beginning of e-commerce as we know it today.

• 2000s - Web 2.0:
  • Emergence of user-generated content and social media.

The 2000s brought the emergence of Web 2.0, characterized by user-generated content and social media. Platforms like Facebook, YouTube, and Wikipedia allowed users to create and share content, transforming the web into a more interactive and collaborative space.

• 2010s - Mobile Web:
  • Rise of smartphones and responsive web design.

The rise of smartphones in the 2010s led to the development of responsive web design, ensuring that websites function well on all devices. This period also saw the growth of mobile apps and the increasing importance of mobile-friendly websites.

• 2020s - Modern Web:
  • Advancements in PWAs, SPAs, and WebAssembly.

The 2020s have seen advancements in Progressive Web Apps (PWAs), Single Page Applications (SPAs), and WebAssembly. These technologies enhance the performance, functionality, and user experience of web applications, making them more powerful and versatile.

The Internet vs. the World Wide Web

The World Wide Web (WWW) is a global system of interconnected documents and resources accessed through the internet.

• Global System: The web spans the entire world, connecting users and resources across geographical boundaries.
• Interconnected Documents and Resources: The web is not just websites, but also includes multimedia content, applications, and other digital assets.
• Hypertext Links: Web pages are linked together using hyperlinks, allowing users to navigate seamlessly between information.
• Accessed Through the Internet: The web relies on the underlying infrastructure of the internet for communication and data transfer.

The World Wide Web (WWW) is a global system of interconnected documents and resources accessed through the internet. It spans the entire world, connecting users and resources across geographical boundaries. The web is not just websites but also includes multimedia content, applications, and other digital assets. Web pages are linked together using hyperlinks, allowing users to navigate seamlessly between information. The web relies on the underlying infrastructure of the internet for communication and data transfer.

Essentially, the web is a layer built on top of the internet that provides a user-friendly way to access and interact with information. The internet is the foundation, providing the infrastructure, while the web is the application, providing the content and services.

The role of Front-end Dev. in E-commerce

• Customer Experience and Engagement: A well-designed website with intuitive navigation and engaging content can significantly improve the customer experience.
• Online Transactions and Payments: Web development is essential for creating secure and reliable online payment systems.
• Marketing and Branding: Web development allows businesses to create a strong online presence, build brand awareness, and reach their target audience.
• Data Collection and Analysis: Web development tools can be used to track user behavior, collect data, and analyze customer preferences.

A well-designed website with intuitive navigation and engaging content can significantly improve the customer experience. Web development is essential for creating secure and reliable online payment systems. It allows businesses to create a strong online presence, build brand awareness, and reach their target audience. Web development tools can also be used to track user behavior, collect data, and analyze customer preferences.

The Role of Back-End Development

• Back-end development handles the server-side logic of a web application. It involves:
  • Data storage and management: Interacting with databases to store and retrieve data.
  • Business logic: Implementing the rules and processes that govern the application’s behavior.
  • Server configuration: Setting up and managing web servers to host the application.
• Back-end languages and frameworks include:
  • Programming languages: Python, Ruby, Java, PHP, Node.js
  • Frameworks: Django, Ruby on Rails, Spring Boot, Express.js

Back-end development handles the server-side logic of a web application. It involves data storage and management, interacting with databases to store and retrieve data. Back-end developers implement the business logic, which includes the rules and processes that govern the application’s behavior. They also handle server configuration, setting up and managing web servers to host the application.

Back-end languages and frameworks include programming languages like Python, Ruby, Java, PHP, and Node.js, as well as frameworks like Django, Ruby on Rails, Spring Boot, and Express.js.

Note: While PHP and JavaScript are both popular programming languages, they have different strengths and use cases:

• PHP: A general-purpose server-side scripting language widely used for web development. It’s well-suited for building dynamic websites and web applications.
• Node.js: A JavaScript runtime environment that allows you to run JavaScript code on the server. It’s gaining popularity for building scalable and real-time applications.

While PHP and JavaScript are both popular programming languages, they have different strengths and use cases. PHP is a general-purpose server-side scripting language widely used for web development. It’s well-suited for building dynamic websites and web applications. Node.js is a JavaScript runtime environment that allows you to run JavaScript code on the server. It’s gaining popularity for building scalable and real-time applications.

Client / Server Architecture

Web Browser

• A software application that interprets and displays web pages.
• Examples: Chrome, Firefox, Safari, Edge
• Functionality:
  • Fetches web pages from servers based on URLs.
  • Renders HTML, CSS, and JavaScript to create the visual interface.
  • Handles user interactions and navigation.

A web browser is a software application that interprets and displays web pages. Examples include Chrome, Firefox, Safari, and Edge. The browser fetches web pages from servers based on URLs, renders HTML, CSS, and JavaScript to create the visual interface, and handles user interactions and navigation.

Web Server

• A computer system that stores and delivers web pages and other web content.
• Examples: Apache, Nginx, IIS
• Functionality:
  • Receives HTTP requests from browsers.
  • Processes requests and retrieves the requested content from storage.
  • Sends the content back to the browser as an HTTP response.

A web server is a computer system that stores and delivers web pages and other web content. Examples include Apache, Nginx, and IIS. The server receives HTTP requests from browsers, processes the requests, retrieves the requested content from storage, and sends the content back to the browser as an HTTP response.

Introduction to HTTP Protocol

• What is HTTP?
  • HTTP (HyperText Transfer Protocol) is the foundation of data communication on the web.
  • Used for transmitting web pages and other resources.

HTTP (HyperText Transfer Protocol) is the foundation of data communication on the web. It is used for transmitting web pages and other resources between clients (browsers) and servers.

• How HTTP Works:
  • Request-Response Model:
    • Client (Browser) sends an HTTP request to the server.
    • Server processes the request and sends back an HTTP response.

HTTP operates on a request-response model. The client (browser) sends an HTTP request to the server, which processes the request and sends back an HTTP response. This model enables the communication and data exchange that powers the web.

• Common HTTP Methods:
  • GET: Requests data from a server (e.g., loading a web page).
  • POST: Submits data to a server (e.g., submitting a form).

Common HTTP methods include: - GET: Requests data from a server, such as loading a web page. - POST: Submits data to a server, such as submitting a form.

• HTTP Status Codes:
  • 200 OK: The request was successful.
  • 404 Not Found: The requested resource could not be found.
  • 500 Internal Server Error: The server encountered an error.

Common HTTP status codes include: - 200 OK: The request was successful. - 404 Not Found: The requested resource could not be found. - 500 Internal Server Error: The server encountered an error.

• Why HTTP Matters:
  • Foundation of the Web: Enables communication between browsers and servers.
  • User Experience: Ensures web pages load and function correctly.

HTTP is the foundation of the web, enabling communication between browsers and servers. Understanding HTTP is essential for grasping how the web works, making it a fundamental concept in web development and e-commerce.

• Conclusion:
  • Understanding HTTP is essential for grasping how the web works, making it a fundamental concept in web development and e-commerce.

Understanding HTTP is essential for grasping how the web works, making it a fundamental concept in web development and e-commerce.

Sequence

sequenceDiagram participant Browser participant Web Server

Browser->>Web Server: Sends HTTP GET request for URL
Web Server->>Web Server: Processes request, retrieves content
Web Server-->>Browser: Sends HTTP response with content

Browser->>Web Server: Sends HTTP POST request with form data
Web Server->>Web Server: Processes request, updates data
Web Server-->>Browser: Sends HTTP response with success message

Browser->>Web Server: Sends HTTP request for image
Web Server->>Web Server: Retrieves image from storage
Web Server-->>Browser: Sends HTTP response with image