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, triggering an audible alarm to alert the owner and deter potential thieves. Many modern car alarm systems also feature remote keyless entry, allowing users to lock and unlock their vehicles from a distance. Some advanced systems can send notifications to a smartphone if an alarm is triggered, providing added peace of mind for vehicle owners.