A Reaction Control System (RCS) is a crucial component in spacecraft that helps control its orientation and movement in space. It uses small thrusters to generate forces that adjust the spacecraft's attitude, allowing it to point in the desired direction. This is essential for tasks like docking with other spacecraft or aligning instruments for scientific observations. The RCS typically consists of multiple thrusters strategically placed around the spacecraft. By firing these thrusters in specific combinations, the spacecraft can rotate or stabilize itself without relying on larger engines. This system is vital for missions involving satellites, space probes, and crewed spacecraft.