In software, a module is a part of a program. Programs are composed of one or more independently developed modules that are not combined until the program is linked. A single module can contain one or several routines.
Chat
A popular form of interactive, online communication that allows Internet users to have real-time conversations with others via computer. When participating in a chat discussion, Internet users enter virtual chat areas, usually organized by topic of interest, where they can exchange instant communications with like-minded individuals.
Image map
An image containing one or more invisible regions which are linked to other pages. If the image map is defined as a separate file, the search engines may not be able to index the pages to which that image map links. The way out is to have text hyperlinks to those pages in addition to the links from the image map. However, image maps defined within the same Web page will generally not prevent search engines from indexing the other pages.

