Magit is an interface to the version control system Git, implemented as an Emacs package. It allows you to interact with git in Emacs.
Magit is an interface to the version control system Git, implemented as an Emacs package. Magit aspires to be a complete Git porcelain. While we cannot (yet) claim, that Magit wraps and improves upon each and every Git command, it is complete enough to allow even experienced Git users to perform almost all of their daily version control tasks directly from within Emacs. While many fine Git clients exist, only Magit and Git itself deserve to be called porcelains.
Note that Magit can interface itself to Github (with Magithub, see also Github integration in Emacs) and that Emacs also has packages to work with Gitlab, Bitbucket and others.