Molecular-Nuclear Resonance refers to the interaction between molecular vibrations and nuclear spins in a substance. This phenomenon occurs when the energy levels of molecular vibrations match the energy levels of nuclear spins, leading to enhanced signals in techniques like Nuclear Magnetic Resonance (NMR). This resonance is crucial for understanding molecular structures and dynamics. By analyzing the resulting spectra, scientists can gain insights into molecular interactions, conformations, and even chemical environments, making it a valuable tool in fields such as chemistry, biochemistry, and material science.