What is classroom management?

Classroom management is the term used to describe methods of preventing misbehavior and ways of dealing with it. They are the techniques instructors use to maintain control in the classroom. The lack of effective classroom management can reduce learning in the classroom because instructor time is spent dealing with unruly students. Let me know of some situation you guys may have encountered in the classroom and how you resolved it
Here is a link to a site with some good classroom techniques:

http://www.ngsslifescience.com/classroom management