What is anger?

Anger is very strong feeling of annoyance, hostility, or displeasure. It's a negative feeling.
--Why is it important to deal with anger?--
It can damage your relationship with others, get in the way of your success, and impact the way people look at you.
--What are the benefits of learning to deal with anger?--
It allows you to control how you act, you won't hurt others (physically and mentally), you'll gain more respect from others.