What is the World Wide Web?
- The Web is a network of computers all over the world
- All the computers in the Web can communicate with each other
- All the computers use a communication protocol called HTTP
How does the WWW work?
- Web information is stored in documents called web pages
- Web pages are files stored on computers called web servers
- Computers reading the web pages are called web clients
- Web clients view the pages with a program called a web browser
- Popular browsers are Google Chrome, Firefox, and Internet Explorer
How does a Browser Fetch a Web Page?
- A browser fetches a page from a web server by a request
- A request is a standard HTTP request containing a page address
- An address may look like this: http://www.example.com/default.htm
How does a Browser Display a Web Page?
- All web pages contain instructions for display
- The browser displays the page by reading these instructions
- The most common display instructions are called HTML tags
- HTML tags look like this <p>This is a paragraph.</p>
What is a Web Server?
- The collection of all your web pages is called your web site
- To let others view your web pages, you must publish your web site
- To publish your work, you must copy your site to a web server
- Your own PC can act as a web server if it is connected to a network
- Most common is to use an Internet Service Provider (ISP)
What is an Internet Service Provider?
- ISP stands for Internet Service Provider
- An ISP provides Internet Services
- A common Internet service is web hosting
- Web hosting means storing your web site on a public server
- Web hosting normally includes email services
- Web hosting often includes domain name registration