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timeline

The list of recent commits on a repository's page: when, who, what, and the revision each one is. It is the fastest way to see whether a repository is alive and what it has been doing.

revision

The name of one exact commit - a long string of letters and digits, shown shortened. It is derived from the content itself, so it cannot be reassigned: quote a revision and you have named one unambiguous state of the work, for as long as the repository exists.