Why is Git Bash called bash? [closed]

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Why is Git Bash called "bash"? Is there really that much connection between the git shell and the unix shell? For instance, when Git Bash is being used on Windows I don't believe many Unix commands are understood. Wouldn't it be better named "Git Shell" and not "Git Bash"? Bash should remain a specific reference to the Unix "Bourne-again shell". Can someone explain what I might be missing?

Update: A year ago, the version of Git I was using incorporated something called Git Bash. Nowadays, if I download "github for windows" from Github, I get an icon for a GUI to talk directly with Github and an icon called "Git Shell", not "Git Bash", as you see in the image below. So I just realized that someone might have felt the same way as me before I felt that way.

Answer 1

Git Bash is the GNU bash shell. Try typing echo $BASH_VERSION at the prompt.

Like any shell, it has some built-in commands (all of which should be available); other commands are executables you can invoke from the shell. If some of those commands happen to be missing, that's not an attribute of the shell; those commands just don't happen to be installed on your system.

What you're missing is that most of the command you invoke at a shell prompt are not part of the shell.