Cucurbit[8]uril (CB[8]) hydrate is widely used in supramolecular chemistry due to its ability to form stable host-guest complexes. It is particularly effective in binding two guest molecules simultaneously, making it valuable in constructing molecular assemblies and switches. In drug delivery, CB[8] enhances the solubility and stability of hydrophobic drugs, improving their bioavailability. It is also employed in the development of responsive materials, such as hydrogels, which can change properties in response to external stimuli. Additionally, CB[8] plays a role in catalysis by stabilizing transition states and intermediates in chemical reactions. Its applications extend to biosensing, where it helps in the detection of specific biomolecules through selective binding.