Computing
- Tag (metadata), an index term assigned to a piece of information
- Tag URI, a unique identifier protocol used in internet technologies
- Tag (programming), a method for passing parameters to subroutines
- TAG (BBS), a bulletin board software program
- HTML tag, a component of the HTML programming language
- Knowledge tag, a type of meta-information that captures knowledge about an information resource
- Revision tag, a label for a specific revision of a project
- Tag system, a deterministic computational model
- Using a tag editor to edit the metadata of multimedia content
- The entries in tag files generated by ctags, indexes to identifiers in source code
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