Hi there, I don't know if this is the right place to ask but... what does a mentor is supposed to do?

I, as a developer/"wannabe entrepreneur" have never had something that I could call a "mentor"... maybe the boss of my first job, but I didn't see him as a guiding force in my career.

What should a mentor do? How do I interact with one? I mean, I send him a piece of code for reviewing? Tell him or her about what I did that day?

Hope my questions are not too rude/off topic.

Thanks a lot!