In the Alapin variation of the Sicilian, the game goes 1. e4 c5 2. c3. However, this sequence just blocks the b1 knight from its best square, and it doesn't develop anything. Both squares attacked by the pawn are already being attacked by black's other pawn.
What is the point of the move 2. c3? I do understand that it can be used to avoid a mainline Sicilian, but at least develop some other good piece.