Parallel universes, also known as multiverses, are hypothetical realities that exist alongside our own. Imagine a world where every choice you make creates a new universe, leading to countless versions of yourself living different lives. In these universes, everything from the smallest details to major events can vary, creating endless possibilities. Scientists and philosophers explore the idea of parallel universes to understand the nature of reality. Some theories suggest that these universes could be connected through wormholes or other cosmic phenomena. While we haven't found direct evidence of parallel universes, they spark our imagination and challenge our understanding of existence.