What does "compulsion" or "compulsive" mean?

What does "compulsion" or "compulsive" mean?

Marc Kern (Addiction Expert, Director of Addiction Alternatives) gives expert video advice on: How is a behavioral addiction similar to a substance behavioral addiction?; What is an "addictive personality"?; What can be done about an addictive personality? and more...

Compulsive means to do the behavior over and over again. I know people who find comfort, a good feeling, by straightening out pencils on a desk. That could become compulsive if that's the only way you can bring about calm inside and good feelings. So behaviors are compulsive, and thoughts are obsessive.