1. A command in a markup language, such as HTML, to display information in a certain way, such as bold, centered or using a certain font. From I-gloss

2. In HyperText Markup Language (HTML), a code that identifies an element (a certain pan of a document, such as a heading or list) so that a Web browser can tell how to display it. Tags are enclosed by beginning and ending delimiters (angle brackets). Most tags begin with a start tag (delimited with <>), followed by the content and an end tag (delimited with </>), as in the following example: <H1>Welcome to my home page</H1> From QUECID