The Webmaster's Lexicon: A

Action	A form attribute that specifies the CGI program to process the form data. It specifies the action URI for the form. This URI will almost always point to a CGI script to decode the form results; but it could, for example, be a mailto.
ActiveX	A Java-like Microsoft language that permits web-originated programs to be run from the Microsoft Explorer browser.
Align	An HTML attribute that specifies the relative position of an object on a page, such as an image, or the contents of a table cell.
Alt	An Img (image) attribute that specifies text that can be displayed by a browser as an alternative to the image.
Anchor	An HTML tag that specifies the beginning or end point of a hyperlink, typically, a phrase marked as an A element. An anchor may also be a named place in a document that other documents can form a link to. An anchor must include a name or href attribute, and may include both. There are several optional attributes, but they are rarely encountered. An anchor includes a piece of text or some other object (for example an image icon) which marks the beginning and/or the end of a hypertext link. The contents between the opening and closing tags, <A name=name href="URL"> ...stuff... </A> is the start of a link to the URL specified, or the target of any link to the name fragment.
Animation	The addition of movement to a web page. This can be accomplished by using Java, Shockwave, GIF animation, or other multimedia techniques.
Applet	A high-level program that can be included in an HTML page, much like an image can be included. The program's code is then executed by the browser. Note: Many older browsers cannot interpret Java applets and disregard them.
Array	In programming, a group of related objects, all having the same type and size.
ASP	Active Server Pages, a Microsoft technology for building dynamic pages, usually with JScript and Visual Basic as languages.
Attribute	A parameter or setting of a tag, that affects the way the tag is re ndered.
Audio	Digitizing voices, music, et.c. so they can be played by a computer. Popular sound file formats include AU, WAV, SND, MPEG, MIDI, AIFF.
Authoring	The process of creating web documents or software.