The Webmaster's Lexicon: I

Icon	Small graphic image intended to represent some hyperlinked page or service.
Image	A picture or illustration, also called graphic. Formats include GIF, JPEG, BMP, PCX, and TIFF. An inline image is mixed with text and displayed surrounded by text.
Imagemap	Images which have specified areas hyperlinked to some other page or service. An image with a number of different links associated with it. Clicks on different portions of the image go to different links. All browsers that can display images support server-side imagemaps; newer browsers also support client-side imagemaps, which resolve more quickly and can provide more feedback to the user.
Img	An HTML tag indicating an inline image.
Indexing	The process of analysing some data, e.g. web pages, and recording the occurences of keyword for later use by search engines. Indexing programs read pages throughout the web and add a description of their contents to a database that can be searched by users looking for specific information.
Input	An HTML form tag allowing the user to enter data.
Internet	The global network of computers on which the web is based.
Isindex	An HTML tag used in the Head area of a document to allow user queries (archaic). Keywords for searching will be passed from the browser to the server by suffixing, to the URL, a question mark followed by a list of keywords, separated by plus signs. The ISINDEX element is usually generated automatically by a server-side script. The URL used for processing queries can be overridden with the HREF attribute. You can also use the PROMPT attribute to change the default prompt supplied by the browser, e.g. <ISINDEX HREF="phone.db" PROMPT="Enter Surname:"> (Netscape).