The behavior involving physical force intended to hurt ,injure or even kill someone or something.Basically , aggression is all from the brain , specifically from the hypothalamus,a gland in the brain that controls hormone system.The hypothalamus causes aggressive behavior when electrically stimulated .The term used to describe anger may be volcanic ,because just like a volcano,an angry individual erupts .

When an angry feeling coincides with aggressive or hostile behavior,the amygdala,an almond shaped part of the brain associated with emotions, particularly fear ,anger and anxiety,is activated.