A car alarm system is a security device designed to protect vehicles from theft and unauthorized access. It typically includes sensors that detect movement, door openings, or glass breakage. When triggered, the system emits a loud siren or alarm, alerting the owner and deterring potential thieves. Many modern car alarm systems also feature additional functions, such as remote keyless entry and GPS tracking. Some systems can send notifications to the owner's smartphone if an intrusion is detected. These features enhance vehicle security and provide peace of mind for car owners.