A constitutional amendment process outlines how changes can be made to a constitution, ensuring adaptability over time. In the U.S., for example, amendments can be proposed either by a two-thirds majority in both houses of Congress or by a national convention called by two-thirds of state legislatures. Ratification then requires approval from three-fourths of state legislatures or conventions. This rigorous process ensures that amendments reflect a broad consensus and helps maintain stability while allowing constitutional evolution in response to changing societal needs.