A coupling is a mechanical device used to connect two shafts together at their ends, transmitting power between them. They come in various types, including rigid, flexible, and fluid couplings, each serving specific purposes based on the application requirements. Couplings provide alignment, torque transmission, and compensation for shaft misalignment, vibration, or shock loads, ensuring smooth operation and preventing damage to machinery. They are commonly found in automotive, industrial, and machinery applications, facilitating the efficient transfer of rotational motion between shafts in diverse environments. Couplings play a critical role in enhancing the performance, reliability, and longevity of mechanical systems.