Q：

Describe how to access the Internet. What are the providers? Define browsers and discuss URLs, HTML, javascript, AJAX, applets, and mobile browsers

A：

The most common way to access the Internet is through an Internet service provider.
Providers are already connected to the Internet and provide a path or connection for individuals to access to the Internet.

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 typically contains Hypertext Markup Language(HTML).

Web pages also can contain special programming to add interest and activity.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.

Mobile browsers are designed to run on a variety of mobile devices which access the Internet.