A feedback system is a process that uses information about the output of a system to adjust its input or operation. This helps maintain stability and improve performance. For example, in a thermostat, the system measures the room temperature and adjusts the heating or cooling to reach the desired level. There are two main types of feedback systems: positive feedback and negative feedback. Positive feedback amplifies changes, leading to a greater output, while negative feedback reduces changes, promoting stability. Both types are essential in various fields, including biology, engineering, and economics, to ensure systems function effectively.