The name of the unified theory that aims to explain the four fundamental forces of nature is "The Theory of Everything" or "Grand Unified Theory" (GUT). This theoretical framework seeks to unify three of the fundamental forces: electromagnetism, the strong nuclear force, and the weak nuclear force.
In a Grand Unified Theory, these three forces are described by a single mathematical framework, suggesting that they are different manifestations of a more fundamental force at high energies. However, the unification of these three forces does not include gravity, which is described by Einstein's general theory of relativity.
The ultimate goal of theoretical physics is to develop a theory that unifies all four fundamental forces into a single, comprehensive framework that describes the behavior of matter and energy at all energy scales. Such a theory is often referred to as a "Theory of Everything" (ToE) as it would provide a unified understanding of the fundamental interactions and the nature of the universe. However, scientists have not yet achieved a complete and experimentally verified Theory of Everything.