Service managemnt & Customer service

Hi Experts,

First of all i should appreciate each one of the community for sharing their knowledge which is great help for the people like me. Here is one more question.

Is Service management and Customer service modules are same?

If so is there any standard PDF's just like in SD?

i appreciate if somebody could get me some documents related to the module.

Email: sapkrishna4@gmail.com

Thank you so much

Anil