Why does git ask for users' email address?

Question

Why does git ask for users' email address, and include it in each commit?

Answer 1

So that someone else can know who committed the change.

By the way, it is a simple matter to configure git with a default email address for your commits. It is explained in the Git SCM ebook:

• https://git-scm.com/book/en/v2/Getting-Started-First-Time-Git-Setup