What is meant by pocket veto?

The President also has veto power by which he can withhold or refuse to give assent to Bills (other than Money Bill) passed by the Parliament. Every bill passed by the Parliament goes to the President for his assent before it becomes a law. The President can send the bill back to the Parliament asking it to reconsider the bill. This “veto’ power is limited because, if the Parliament passes the same bill again and sends it back to the President, then, the President has to give assent to that bill. However, there is no mention in the Constitution about the time limit within which the President must send the bill back for reconsideration. This means that the President can just keep the bill pending with him without any time limit. This gives the President an informal power to use the veto in a very effective manner. This is sometimes referred to as ‘pocket veto’.