What does 'setrear' mean on the car's air conditioner?

[LaLondyn]

The 'set-rear' button found in a car's air conditioning system is the rear window defogger button. Here are methods to defog the rear windshield in winter: 1. Open windows for convection: Crack open the side windows slightly to allow air flow between inside and outside the car, reducing temperature differences and gradually eliminating fog; 2. Use the air conditioning system: Simply select the appropriate setting to direct the AC airflow for defogging; 3. Apply professional defogging spray: Spray the defogger onto the inner surface of the car window, then wipe it clean. This not only removes dirt but also forms a protective film to prevent moisture condensation and fog formation on the glass.