What can veto do?

vetoes

Only the president can veto a bill.

With a "regular" veto, the president prevents it from becoming a law by withholding his signature and returning it to Congress; with a pocket veto he also withholds his signature, but does so when...

A pocket veto is a presidential veto, but of a particular type. There are two types of vetoes: a regular or return veto, when the president sends a bill, along with his objections, back to Congress...