An air conditioner is a system designed to control indoor temperature, humidity, and air quality by removing heat from the indoor environment and releasing it outside. It works on a refrigeration cycle where the refrigerant absorbs heat from indoor air and transfers it through the compressor and condenser to the outdoor unit. The cooled air is then circulated back into the room, creating a comfortable living or working environment. Air conditioners are widely used in homes, offices, and commercial spaces, offering efficient cooling, improved air circulation, and enhanced comfort, especially in hot and humid climates.