An alarm system is a security device designed to detect unauthorized entry or emergencies, such as fire or gas leaks. It typically includes sensors, alarms, and control panels that work together to monitor a property. When a sensor is triggered, the system activates an alarm to alert occupants and can also notify local authorities or a monitoring service. There are various types of alarm systems, including burglar alarms, fire alarms, and carbon monoxide detectors. Many modern systems can be integrated with smart home technology, allowing users to control and monitor their security remotely through smartphones or other devices.