git pull unclear manual

Hello,

Here is how "git help pull" begins:

<q>
NAME
       git-pull - Fetch from and integrate with another repository or a local
       branch

SYNOPSIS
       git pull [<options>] [<repository> [<refspec>...]]
</q>

From this, how do one figures how to "integrate with ... local branch"?

Is "git pull" useful to integrate with a local branch at all?

Thanks,
-- Sergey