This document provides an overview of different types of air compressors, including reciprocating and rotary compressors. It discusses the definition, working principle, applications, and advantages of reciprocating compressors. It also outlines the types of reciprocating compressors and describes different types of rotary compressors such as positive displacement root blowers and vane compressors, and non-positive displacement centrifugal compressors. The document was prepared with guidance from several professors and concludes with a thanks and an invitation for any questions.