Git is a version control system that enables collaboration and code tracking. An important aspect is the use of branches to work on features and fixes. When working on a branch, two key commands are git merge and git rebase. The difference lies in how the history is handled. Merging preserves the history, while rebasing moves local commits on top of the latest remote changes, creating a linear history. Additionally, options like --no-ff and --squash affect how the commit history appears, with --no-ff keeping individual commits and --squash combining them into one.
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