GitHub allows developers to synchronize branches, clone repositories, and more. Pull requests, merge button, fork queue, issues, pages, wiki: all awesome features that make sharing easier. But those things are only great after you've pushed your code to GitHub.
Synchronize branches:
The sync button pushes your changes to GitHub and pulls down other's changes in one operation. It notifies you know when you have changes you haven't pushed or there are new changes on GitHub you haven't pulled down.
Clone repositories in one click:
When you add repositories to GitHub for Mac, we automatically match them up with any organizations you belong to. Want to pull down a repository from GitHub.com? Check out the button on the website.
Powerfully simple branching:
Branching is one of Git's best features. We've made it easy to try out remote branches, create new local branches and publish branches to share with others.