Q、Describe how to access the Internet.

A、The most common way to access the Internet is through an Internet service provider(ISP).The providers are already connected to the Internet and provide a path or connection for individuals to access the Internet.

Q、What are the providers?

A、The providers are already connected to the internet and provide a path or connection for individuals to access the internet.The most widely used commercial Internet service providers use telephone lines,cable,and/or wireless connections.Some of the best-known providers are Verizon,AT&T,Sprint,and T-Mobile.

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

A、URLs : for browsers to connect to resources,the location or address of the resources must be specified.these addresses are called uniform resource locators(URLs).

HTML : 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).the browser interprets the HTML formatting instructions and displays the document as a Web page.

javascript : 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.

AJAX : 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.

applets : applets are written in the java programming language.these programs can be downloaded quickly and run by most browsers.

mobile browsers : Today it is common to access the internet from a variety of mobile devices like cell phones.special browsers called mobile browsers are designed to run on these portable devices.