Unified theories aim to combine different fundamental forces of nature into a single framework. For example, they seek to merge the electromagnetic force, weak nuclear force, and strong nuclear force with gravity. This approach helps scientists understand how these forces interact and function together at both large and small scales. One prominent example of a unified theory is string theory, which proposes that the basic building blocks of the universe are tiny, vibrating strings. By unifying the forces, researchers hope to create a comprehensive model that explains all physical phenomena, potentially leading to breakthroughs in our understanding of the universe.