The term "supramolecular" refers to the study of structures and systems formed by molecules that are held together by non-covalent interactions, such as hydrogen bonding, van der Waals forces, and electrostatic interactions. These structures are distinct from those formed by covalent bonds, which involve the sharing of electrons between atoms. Supramolecular chemistry focuses on the understanding and manipulation of these non-covalent interactions to create complex, self-assembled structures with unique properties and functions.