Competition is a common phenomenon in our social life. We compete when we play games, we try to do better than others in our study, and there is constant competition for jobs, fame, wealth and so forth. We can say that, in a certain sense, competition is one of the motive forces of the development of the society.
We often find competition and cooperation at the same time. Think of a football game. During the game, one team is competing against the other, but each member of the team must cooperate with his teammates. Otherwise, they would lose the game however skilled every individual player might be.