Explain p4 branch spec ?

Q 86. Explain p4 branch spec ?

Create or edit a branch mapping and its view.

p4 [g-opts] branch [-f] branchspec
p4 [g-opts] branch -d [-f] branchspec
p4 [g-opts] branch [-S stream] [-P parent] -o branchspec
p4 [g-opts] branch -i [-f]