The What

What is the tl;dr of the tool? How does it differ from the description of its category, Version Control?

Git is a Version Control System (VCS).

The Why

Why use this tool over an alternative?

Git offers a convenient decentralised model over the client-server model of e.g. SVN, which makes it simpler for developers to work in isolation and combine their changes after the fact. Mercurial is a good alternative with a comparable feature set.

Alternatives

For
vcs

No alternatives added yet

For other environments

No alternatives added yet

Git