Cucurbituril is widely used in supramolecular chemistry due to its unique ability to form stable host-guest complexes. Its rigid, barrel-shaped structure allows it to encapsulate various molecules, making it valuable in drug delivery systems for enhancing the solubility and stability of pharmaceuticals. It is also employed in molecular recognition and sensing applications, where it selectively binds to specific ions or molecules, enabling the detection of pollutants or biomarkers. Additionally, cucurbituril is utilized in catalysis, where it can stabilize reactive intermediates or control the reactivity of substrates. Its applications extend to nanotechnology, where it assists in the assembly of molecular machines and nanostructures. In environmental science, it is used for the removal of toxic substances from water through selective binding.