e structure and formatting of a document by using ordinary characters embedded in the text. This
 system of tags identifies the logical components of the document and relates them to a syntactic definition of the documen
t structure. [Computer and Information Sciences] 
n., In computing, a predefined set of descriptors (symbols and tags) or a method of defining descriptors that are used to embed
external information in an electronic text document, usually to specify formatting or facilitate analysis. [Compu