Circuit breakers are safety devices used in electrical systems to prevent overloads and short circuits. They automatically interrupt the flow of electricity when they detect a fault, protecting both the wiring and connected devices from damage. By doing so, they help maintain the safety and reliability of electrical systems in homes and businesses. When a circuit breaker trips, it can be reset manually once the issue is resolved. This is different from a fuse, which must be replaced after it blows. Circuit breakers come in various types, including thermal, magnetic, and GFCI (Ground Fault Circuit Interrupter), each serving specific safety functions.