Article V of the United States Constitution outlines the process for amending the Constitution. It allows for two methods of proposing amendments: either by a two-thirds majority vote in both houses of Congress or by a convention called for by two-thirds of state legislatures. Once an amendment is proposed, it must be ratified by three-fourths of the states, either through their legislatures or by state conventions. This process ensures that any changes to the Constitution reflect a broad consensus among both federal and state representatives.