How does a car remote work to unlock and start a vehicle?

A car remote works by sending a wireless signal to the vehicle when you press a button, usually using radio frequency. For unlocking, the car's receiver recognizes the signal and triggers the door locks. For starting the vehicle, the remote sends a coded signal that the car's system verifies before allowing the engine to start. This only works if the remote is close enough and properly synced with the car’s security system.