Couplings are mechanical devices used to connect two shafts together, allowing them to transmit power and motion. They can accommodate misalignment between the shafts and help reduce vibrations, ensuring smooth operation in various machines and systems. Common types of couplings include flexible couplings, rigid couplings, and universal joints. In addition to their mechanical function, couplings are also found in plumbing and piping systems, where they connect different sections of pipes. These couplings can be made from various materials, such as metal, plastic, or rubber, depending on the application and the required strength and flexibility.