Anger is a normal, usually healthy human emotion.  Anger is a substitue emotion.  When it gets out of control and turns destructive, it can lead to problems.  A presentation describing what is anger and how to manage one's anger.  

Refrences :

American Psychological Association.  Controlling Anger - Before it Controls you

Mayo Clinic. Anger management.  Explore your anger to gain control

http://www.mayoclinic.com/health/anger-management/MH00073

http://www.apa.org/topics/controlanger.html