Vapor-compression refrigeration cycle

The vapor-compression refrigeration cycle uses a carefully chosen refrigerant substance to transfer heat from the inside of the box to the surroundings. It uses four devices to make it happen. I will describe the cycle from the throttle, but since it's a cycle any other starting point is valid. Many explanations of the vapor-compression cycle use the expressions "high/low pressure, high/low temperature" (HP, LP, HT, LT) without saying compared to what, causing confusion. I tried to clarify the use of those expressions every time there might be some doubt.