Job Interview Questions: Job interview process?

i had a job interview today at dunkin donuts, it went pretty well. i left and about 3 minutes later the manager called me and said that she liked me and is going to send my application into human resources and then set up a different interview.
i'm kind of confused as to why that's necessary? maybe it's common sense, but i'm just a kid who has never had a job before
thanks (:

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It sounds like a good sign to me, I don't think she would go through the trouble of even calling you unless she were being sincere.

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