Answer:
Caliban is Prospero's dark, earthy slave. He tried to take Miranda's innocence, and as a result, Prospero imprisoned him and tried to civilize him by teaching him language. Caliban's behavior is harmful as he is completely savage and unable to control his basic drives, such as sexual desire.
He is given the tasks such as carrying the wood, and he always protests and curses. As he points out in Act I, Scene II, 'You taught me language, and my profit on't. Is I know how to curse.' Caliban is defiant, full of hatred and discontent, which culminates when he plots against Prospero, together with Stefano and Trinculo.