There are many different ways to define good and evil varying from person to person and context. The general consensus is that behaviors which are harmful, unjust, and morally wrong are "evil" and behaviors which are beneficial, just, and morally right are "good". In a Christian context god is viewed as "perfect" and "good" and Satan as a "defiler" and "evil". In a biological context good and evil can be viewed as positive and negative stimuli that evoke different emotional and physiological reactions in individuals. 

Remember, "good" and "evil" depend on the person and context which means a "good" or "evil" for one person and one context may not be the case for everyone everywhere.
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