The three witches, often seen in mythological tales, symbolize the themes of fate, prophecy, and choice. In stories like Shakespeare's "Macbeth," these witches prophesy the hero's future, illustrating how fate can intertwine with human actions. They serve as a reminder of the unpredictable nature of life and the consequences of ambition. This archetype appears across various cultures, emphasizing the complexity of destiny and its impact on individuals.