A generator is a device that uses fuel or another energy source to produce electrical power. It typically consists of an engine, such as an internal combustion engine, and an alternator or generator head. When the engine is running, it drives the alternator, which converts mechanical energy into electrical energy. Generators are commonly used as backup power sources during electricity outages or in situations where a reliable power supply is not available. They play a crucial role in providing electricity for various applications, ranging from powering homes and businesses to supporting construction sites and outdoor events.