CSS:

Abbreviation for Cascading Style Sheet, it is used to change the style of your XHTML document. It can be used to change fonts, sizes, colours, change the colour of backrounds, even for the layout of the web page. CSS is usually applied in a separate document so that if the designer wanted to change an element (like text colour) on all of the pages, he/she can do it all at once, rather than going through every single page and changing it manually.

CLASS OR ID NAME

The way you refer to in id name in CSS is with a # sign, and then the name of your section, like #my_section as the selector. If you were using a class name you would instead use .my_section instead of using the #. A class can be used multiple times throughout your XHTML, but the id can only be used once per page, it is a unique identifier.

BROWSER:

A means of using the internet, some examples would be Fire Fox, Internet Explorer, Opera or Netscape. There are also other non-computer devices that can be used to browse the internet, like the Playstation 3, the Nintendo Wii, or certain portable devices.

HTML:

Abbreviation for Hypertext Markup Language, an old language for encoding websites, the new XHTML language, which is simply a stricter form has made it obsolete.

W3C:

World Wide Web Consortium. If you go here, you can do one of three things: Type in the URL of a website, upload an html document, or copy and paste the code itself, and find out if the code validates. When the code is valid, it means that it that the code’s syntax is 100% correct, and thus will work in all browsers.

XTHML:

Abbreviation for Extensible Hypertext Mark-up Language, it is a standard for making websites, it has made HTML obsolete. The language is exactly the same, except that it is more strict, where HTML is looser, functions may still take place even when the code is not absolutely correct.

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