Molecular interactions is the study of the forces and effects that govern the association and behavior of molecules relative to one another. This research area investigates the nature, strength, specificity, and dynamics of non-covalent forces, such as van der Waals forces, hydrogen bonds, electrostatic interactions, and hydrophobic effects, which are fundamental to processes including molecular recognition, self-assembly, and chemical reactivity. Its significance lies in providing foundational understanding crucial for fields ranging from biochemistry and structural biology to materials science and pharmaceutical design.