What's `git`?

It is a revision control system

You have a repository ("repo"), which contains some files and directories

At any time, you can checkpoint (commit) the current state of the repository

You can easily recover the state at any commit

You can easily display differences between commits from different times

Many people can commit changes to the same repository

It's as easy as possible to resolve conflicting simultaneous changes

It stores the complete history of who changed what and when and why