What is a veto in the context of U.S. legislation?

A veto, in the context of U.S. legislation, is specifically the power of the President to reject a bill that has been passed by both houses of Congress. This action prevents the bill from becoming law unless Congress can override the veto with a two-thirds majority in both the House of Representatives and the Senate. The veto serves as a check on legislative power, ensuring that the President has a say in the laws that govern the country. By exercising this power, the President can express concerns about the legislation, whether due to policy disagreements, constitutional issues, or other considerations. This process is a crucial aspect of the system of checks and balances designed to prevent any one branch of government from becoming too powerful.