An air conditioner is an essential appliance used to cool indoor spaces by removing heat and humidity from the air. It works by circulating refrigerant through coils, absorbing heat from inside a room and releasing it outside. Modern air conditioners come in various types, including window units, split systems, and central cooling systems. They help maintain a comfortable indoor temperature, especially during hot weather. Many models also offer features like air purification, dehumidification, and energy-saving modes. Remote control and programmable timers add to user convenience. Proper maintenance ensures efficient performance and longevity. Air conditioners improve indoor air quality and overall comfort. They are widely used in homes, offices, and commercial spaces.