There is reaching beyond the net, blocking faults and attack hit faults.
Any action which directs the ball into the direction of the opponent, except service and block. An attack is considered completed when the ball has crossed the vertical plane of the net completely or is touched by an opponent.
A block is an action close to the net, while one part of the body is higher than the top of the net and the ball is coming from the opponent. The height of the contact with the ball is not relevant.
Only front-row players may complete a block.