2. is true or untrue depending on how deeply you interpret it. A branch is named, points to a commit and under normal circumstances will track the sequence of

2. is true or untrue depending on how deeply you interpret it. A branch is named, points to a commit and under normal circumstances will track the sequence of commits made via itself (i.e. when you commit and HEAD points to branch b, b starts pointing to the child commit). So you could say it's a named sequence of commits. On the other hand you can reset the branch to any commit in the tree, even ones which aren't even on the current sequence of parents. It is still technically a named sequence of commits, just a totally different one.