The word coaching is becoming a buzzword now. What is it really? Is it the same as mentoring? 

 If a coach is not necessarily an expert on a topic, why would anyone want to talk to a coach?   

People have been talking about having a life coach. How is that different from executive coaching?  

I heard that corporate executives and celebrities have coaches, which makes me think coaching is expensive? How much does it cost to be coached?  What can they expect from a coaching session?  What should someone look for when selecting a coach?