The Constitution limits the president's period for decision on whether to sign or return any legislation to ten days (not including Sundays) while the United States Congress is in session. A return veto happens when the president sends a bill, along with his objections, back to the house of Congress from which it originated. Congress can override the veto by a two-thirds vote of both chambers, whereupon the bill becomes law. If Congress prevents the bill's return by being adjourned during the 10-day period, and the president does not sign the bill, a "pocket veto" occurs and the bill does not become law. Congress can adjourn and designate an agent to receive veto messages and other communications so that a pocket veto cannot happen, an action Congresses have routinely taken for decades. If a bill is pocket vetoed while Congress is out of session, the only way for Congress to circumvent the pocket veto is to reintroduce the legislation as a new bill, pass it through both chambers, and present it to the President again for signature.
https://en.wikipedia.org/wiki/Pocket_veto
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