Simple Thermostat What, In Simple Terms, Is A Multi Stage Thermostat?

What, in simple terms, is a multi stage thermostat? - simple thermostat

This type of thermostat is on systems that have used more than a compressor. When the discharge reaches a point that should be at or above the temperature. The first is the compressor. If the discharge increases, the second compressor is initialized.Basically if the drive does not work, it starts in overdrive.