Control rods are essential components in nuclear reactors, used to manage the fission process. Made from materials that absorb neutrons, such as boron or cadmium, they help regulate the rate of nuclear reactions by either slowing them down or stopping them entirely. This control is crucial for maintaining safe and efficient reactor operations. When inserted into the reactor core, control rods absorb excess neutrons, reducing the number of neutrons available to sustain the fission chain reaction. By adjusting the position of these rods, operators can control the reactor's power output and ensure it operates within safe limits, preventing overheating or potential accidents.