Configuration Management and Release Management

I keep hearing these term, Configuration Management and Release Management. I am slowly coming to some awkward conclusions about them. Before I come to a final conclusion, though, I would like your help: What do these terms mean to you? Are they helpful? Do they represent opportunities for improvement? In what environments should you be using the term?

Before I come to a conclusion, I’d like to hear what you have to say. I appreciate the input.