Competition is, in general, a contest or rivalry between two or more organisms, animals, individuals, economic groups or social groups, etc., for territory, a niche, for resources, goods, for mates, for prestige, recognition, for awards, for group or social status, or for leadership and profit. It arises whenever at least two parties strive for a goal which cannot be shared, where one's gain is the other's loss (a zero-sum game).