Why is Git a DAG?
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Because a Git commit can have more than 1 parent due to merge commits when you do:
git mergeIt can even have more than 2, there's no limit. Although that is not so common (with good reason, 2 is already one too many): softwareengineering.stackexchange.com/questions/314215/can-a-git-commit-have-more-than-2-parents/377903#377903