Supramolecular chemistry is a branch of chemistry that focuses on the study of complex structures formed by the association of two or more molecules through non-covalent interactions. These interactions can include hydrogen bonds, van der Waals forces, and ionic bonds, allowing for the formation of larger, organized assemblies. This field explores how these interactions can lead to the creation of new materials and systems with unique properties. Researchers in supramolecular chemistry often investigate molecular recognition, where specific molecules selectively bind to one another, similar to how a key fits into a lock. Applications of supramolecular chemistry can be found in areas such as drug delivery, sensors, and nanotechnology, where the ability to control molecular interactions is crucial for developing innovative solutions.