Many programmers are young enough that they never knew a world without Git and the developer sites built around it, like GitHub and GitLab. You should be glad, very glad, that Linus Torvalds felt forced to create a better version control system (VCS).

Before that, I used first-generation Source Control Management (SCM) systems such as Revision Control System (RCS), which was… painful. Then along came the Concurrent Versions System (CVS) in 1986, and then Subversion (SVN) in 2000. That same year saw BitKeeper, the once open-source VCS that was Linux's first SCM.