"What are the types of couplings?"

 Couplings can be classified into several types. Mechanical couplings, such as jaw couplings, gear couplings, and chain couplings, rely on mechanical components for torque transmission. Flexible couplings, like rubber couplings and diaphragm couplings, offer some degree of flexibility to accommodate misalignment. Fluid couplings use the principle of fluid dynamics to transfer power and are often used in heavy-duty applications. Magnetic couplings operate based on the magnetic field and provide a non-contact transmission method. For instance, jaw couplings are suitable for applications where precise alignment is achievable, while diaphragm couplings are preferred when significant misalignment is expected.