1、Describe how to access the Internet.

The Internet and the telephone system are similar--you can connect a computer to the Internet much like you connect a phone to the telephone system. Once you are on the Internet, your computer becomes an extension of what seems like a giant computer--a computer that branches all over the world. When provided with a connection to the Internet, you can use a browser program to search the Web.

2、What are the providers?

The providers are already connected to the Internet and provide a path or connection for individuals to access the Internet.

3、Define browsers and discuss URLs, HTML, javascript, AJAX, applets, and mobile browsers.

① Browsers are programs that provide access to Web resources.

②For browsers to connect to resources, the location or address of the resources must be specified. These addresses are called uniform resource locators(URLs).

③Once the browser has connected to the Web site, a document file is sent back to your computer. This document contains Hypertext Markup Language (HTML).

④A language called javascript is often used to trigger simple interactive features, such as opening new browser windows and checking information entered in online forms.

⑤An advanced use of javascript called AJAX can be found on many interactive sites. This technology is used to create interactive Web sites that respond quickly, like traditional desktop application software.

⑥applets are written in the Java programming language.Java applets are used to present animation, display graphics, provide interactive games, and much more.

⑦Special browsers called mobile browsers are designed to run on these portable devices.