The Four Sights refer to the four significant experiences that Siddhartha Gautama encountered during his early life, which profoundly impacted his journey toward becoming the Buddha. These sights—an old man, a sick person, a dead body, and an ascetic—exposed Siddhartha to the realities of human suffering and impermanence, ultimately leading him to seek a deeper understanding of life and enlightenment. They are crucial in understanding Siddhartha's transformation and the foundation of Buddhist teachings on suffering and the path to liberation.