Screw compressors are a type of positive displacement compressor that use two interlocking helical screws to compress air or gas. As the screws rotate, they trap the gas and reduce its volume, increasing pressure. These compressors are known for their efficiency and reliability, making them popular in industrial applications. They are often used in manufacturing, HVAC systems, and refrigeration due to their ability to provide a continuous flow of compressed air. Screw compressors can operate at various pressures and are typically quieter than other types of compressors, such as reciprocating compressors.