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| This is misleading, because branches do not need working trees, and several checkouts may refer to a single branch. -AaronBentley
NOTE: checkouts and repositories do not exist yet
In the simplist of terms, a branch is the information stored along with a [:WorkingTree:working tree] that gives you access to revision control. One of the most important pieces of a branch is the record of all of the previous [:Revision:revisions] that the working tree has ever had.
This is misleading, because branches do not need working trees, and several checkouts may refer to a single branch. -AaronBentley
Another frequent activity done by users within the working tree of a branch is to [:Merge:merge] another branch. In this way users can share changes between two branches -- even if the branch is run by someone else.
Sometimes a branch, named a [:StandaloneBranch:standalone branch] will directly store its own [:Revision:revisions]. At other times, such as when a branch is a [:Checkout:checkout] or is a part of a [:Repository:repository], the revisions elsewhere.