Git is a distributed version control system. Originally written by Linus Torvalds for use in managing the Linux core, it has become very popular with Rails developers. One of its best-liked features is the ease with which branches can be created and merged. It also allows developers to commit changes without having to be connected to a network.
Git is an open-source version control system that does not use a central repository, but rather has each developer maintain their own repository. It is currently used for Linux OS development (Git itself was originally written by Linus Torvalds) and is gaining ground among the Ruby on Rails community.