What is the basis for the ninth Amendment?

The Ninth Amendment to the United States Constitution, ratified in 1791, serves as a safeguard for individual rights not explicitly enumerated in the Constitution. It asserts that the enumeration of certain rights in the Constitution does not mean that other rights not listed are not protected. This amendment emphasizes that the people retain additional rights, reinforcing the principle that the government's power is limited and individual liberties are broad. It underscores the notion that citizens possess fundamental rights beyond those explicitly outlined in the founding documents.