A backup generator is a device that provides electricity when the main power source fails. It can be powered by various fuels, such as gasoline, diesel, or natural gas, and is commonly used in homes, businesses, and construction sites to ensure a continuous power supply during outages. These generators automatically turn on when they detect a power loss, allowing essential appliances and systems, like heating or refrigeration, to keep running. Many people invest in a backup generator to maintain comfort and safety during emergencies, especially in areas prone to severe weather or frequent power interruptions.