The Magna Carta, signed in 1215, is significant in shaping modern democracy as it established the principle that everyone, including the king, is subject to the law. It limited the powers of the monarch by asserting the rights of nobles and setting forth legal procedures that guaranteed justice. The document introduced concepts such as due process and the rights to a fair trial, which would later influence democratic ideals and constitutional law. Over centuries, the Magna Carta became a symbol of the struggle for individual liberties and served as a foundation for future democratic principles worldwide.