The Universal Vibrational DNA Theory (UVDT) proposes that every fundamental string in our universe is paired with an anti-string residing in a vibrationally adjacent dimension. The two are connected by an interdimensional bond whose tension, entanglement, and phase dynamics give rise to particle identity, spacetime geometry, and gravitational phenomena. In this framework, matter emerges from vibrational DNA patterns, gravity emerges from variations in bond density and tension, and time emerges from the relative phase evolution of the paired vibrational modes. Dark matter arises naturally as the gravitational imprint of anti-strings whose vibrational structure does not fully project into our spacetime. Black hole thermodynamics, cosmological horizons, and cosmic acceleration follow from the collective behavior of the bond network. This monograph develops the conceptual, mathematical, and phenomenological foundations of UVDT, offering a unified and testable framework that bridges quantum mechanics, relativity, and cosmology.