The commit message

Just under the author and date, after a blank line, we can see the message we attached to the commit we made; even the message is part of the commit itself.

But there's something more under the hood; let's try to use the git log command with the --format=fuller option:

[13] ~/grocery (master)
$ git log --format=fuller
commit a57d783905e6a35032d9b0583f052fb42d5a1308
Author: Ferdinando Santacroce <ferdinando.santacroce@gmail.com>
AuthorDate: Thu Aug 17 13:51:33 2017 +0200
Commit: Ferdinando Santacroce <ferdinando.santacroce@gmail.com>
CommitDate: Thu Aug 17 13:51:33 2017 +0200

Add a banana to the shopping list