Couplings are mechanical devices used to connect two shafts together, allowing them to transmit power and motion. They play a crucial role in various machines and systems, ensuring that energy flows smoothly from one component to another. Couplings can accommodate misalignment between shafts, which helps prevent wear and tear on the machinery. There are several types of couplings, including rigid, flexible, and universal couplings, each designed for specific applications. For instance, flexible couplings can absorb shocks and vibrations, making them ideal for dynamic systems. Proper selection and maintenance of couplings are essential for the efficiency and longevity of mechanical systems.