how the commit ID come from in GIT?

From: hong zhang <henryzhang62@yahoo.com>
Date: Nov 5, 2012, 20:04 UTC
Message-ID: <1352145846.26267.YahooMailClassic@web141404.mail.bf1.yahoo.com>

List,

Could anyone explain how the git commit ID will include all the files that devloper makes changes on?

How git commit ID works?

Thanks for any help!

---henry

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