The opening bid of 2♣ is used to show a very powerful hand and tells partner that game is in sight, even if responder has garbage.
An opening 2♣ bid has the following properties:
1) It is artificial (that is there is probably no intention to play the hand in Clubs)
2) It is game-forcing. With one notable exception the auction must progress to game. The one exception occurs when opener rebids 2NT.