JavaScript is a scripting language originally developed by Netscape to add interactivity and power to web documents. It is purely client side, and runs completely on the client's browser and computer.

Java is completely different from JavaScript- it's more powerful, more complex, and unfortunately, a lot harder to master. It belongs in the same league as C, C++, and other more complex languages.

DHTML is the embodiment of a combination of technologies- JavaScript, CSS, and HTML. Through them a new level of interactivity is possible for the end user experience.

Extensible Markup Language, or XML, defines the structure of information, or how the information could be stored in a database. For example, an XML language for cooking could have a tag, and could contain tags for

, , and . The power of XML lies in the fact that the information can be stored and retrieved from a database, rendered in a variety of formats, and used for a variety of purposes (for example, on a web page, hand-held computer, or cell phone; or for a cookbook, recipe card club, or book about cilantro). Extensible Hypertext Markup Language, or XHTML, is a reformulation of HTML as an XML application. It�s almost identical to HTML 4.01, but it�s more strict and clean.

For certain CSS styles, an HTML user agent (such as a web browser) may produce different visual or aural results than an XML user agent. Following are some rules to reduce these discrepancies: Use lowercase for element and attribute names in CSS style sheets. Dreamweaver forces style element and attribute names to be lowercase in an XHTML document, regardless of your preferences, in the code that it generates and when cleaning up XHTML. HTML parsers infer the tbody element, but XML parsers do not. Therefore, if you define a tbody style, add the tbody element to your tables. CSS defines different conformance rules for HTML and XML documents; therefore, be aware that the HTML rules apply to an XHTML document delivered as HTML, and the XML rules apply to an XHTML document delivered as XML. Note: In documents that specify the XHTML namespace, browsers and other user agents are expected to continue recognizing the class attribute, and the id attribute as an attribute of type ID. Therefore, you can continue to use the shorthand �.� syntax to reference a CSS class for a selector (for example, P.note); and use the shorthand �#� selector syntax, even if the user agent doesn�t read the DTD.