一、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.

二、What are the providers?

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

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

Browsers are programs that provide access to Web resources.

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

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

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

An 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.

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

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