World Wide Web Basics

Definition and History

• The World Wide Web (WWW or Web) is a system of interlinked hypertext documents that can be accessed via the Internet.
• Invented by Tim Berners-Lee in 1989 while working at CERN.
• The first web page was launched on August 6, 1991.

Key Components

• HTTP (Hypertext Transfer Protocol): a protocol used for transferring data over the web.
• HTML (Hypertext Markup Language): a markup language used to create web pages.
• URL (Uniform Resource Locator): a web address used to locate a specific web page.

Web Technologies

• Front-end development: client-side development using HTML, CSS, and JavaScript.
• Back-end development: server-side development using languages like PHP, Ruby, and Python.
• Databases: used to store and manage data for web applications.

Web Architecture

• Client-server architecture: a client (web browser) requests resources from a server.
• Three-tier architecture: presentation, application, and data storage tiers.

Web Development

• Static websites: websites with fixed content, built using HTML, CSS, and JavaScript.
• Dynamic websites: websites with interactive content, built using server-side languages and databases.
• Responsive web design: designing websites to adapt to different screen sizes and devices.

Web Security

• HTTPS (Hypertext Transfer Protocol Secure): a secure protocol for transferring data over the web.
• SSL/TLS (Secure Sockets Layer/Transport Layer Security): encrypting data in transit.
• SQL injection and cross-site scripting (XSS): common web vulnerabilities.

Definition and History

• The World Wide Web (WWW or Web) is a system of interlinked hypertext documents accessible via the Internet.
• Invented by Tim Berners-Lee in 1989 while working at CERN.
• The first web page was launched on August 6, 1991.

Key Components

• HTTP (Hypertext Transfer Protocol) is a protocol used for transferring data over the web.
• HTML (Hypertext Markup Language) is a markup language used to create web pages.
• URL (Uniform Resource Locator) is a web address used to locate a specific web page.

Web Technologies

• Front-end development involves client-side development using HTML, CSS, and JavaScript.
• Back-end development involves server-side development using languages like PHP, Ruby, and Python.
• Databases are used to store and manage data for web applications.

Web Architecture

• Client-server architecture is a model where a client (web browser) requests resources from a server.
• Three-tier architecture consists of presentation, application, and data storage tiers.

Web Development

• Static websites have fixed content and are built using HTML, CSS, and JavaScript.
• Dynamic websites have interactive content and are built using server-side languages and databases.
• Responsive web design involves designing websites to adapt to different screen sizes and devices.

Web Security

• HTTPS (Hypertext Transfer Protocol Secure) is a secure protocol for transferring data over the web.
• SSL/TLS (Secure Sockets Layer/Transport Layer Security) is used to encrypt data in transit.
• SQL injection and cross-site scripting (XSS) are common web vulnerabilities.