Tag – A tag is a named reference to a specific commit, typically used to mark releases. For instance, tagging a commit as v1.0.0 labels that snapshot as version 1.0.0 of the software. Tags are often immutable and serve as “fixed points” in history. Git supports annotated tags (which include metadata like date and author) and lightweight tags (simple pointers). In trading software, tags allow developers to quickly check out the exact code of a previous release (e.g. to debug an issue reported for version 1.2.3).

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