The document discusses enzyme immobilization, which involves confining enzymes to inert supports. It describes common methods like adsorption, entrapment, microencapsulation and covalent binding. Adsorption binds enzymes to supports via weak bonds while entrapment encloses enzymes in polymers or gels. Covalent binding forms covalent bonds between enzymes and supports. Immobilization improves enzyme stability and allows for reuse, with applications in industry, analytics and therapeutics.