Shaft couplings are mechanical devices used to connect two shafts together, allowing them to transmit power and motion. They help align the shafts and accommodate any misalignment that may occur during operation. Couplings are essential in various applications, including motors, pumps, and gearboxes, ensuring smooth and efficient performance. There are several types of shaft couplings, including rigid, flexible, and universal couplings. Rigid couplings provide a solid connection, while flexible couplings can absorb shock and misalignment. Universal couplings allow for angular movement between shafts, making them suitable for applications with varying angles.