Git is a source control management system like SVN or CVS but with additional features making it faster and more powerful. It allows for offline work, distributed workflows across multiple repositories, and easy branching and merging of code. Key commands include git add to stage files, git commit to commit changes, and git push to push commits to a remote repository. Additional features include stashing work, rebasing branches, and bisecting to find bugs. While more powerful, Git can also be more complicated than other systems.