The document is a report about steam turbines that is submitted to a lecturer. It introduces the team members and provides an outline that it will discuss what a steam turbine is, the basic principle, classification, single stage turbine principle, and conclusion. A steam turbine extracts thermal energy from pressurized steam to perform mechanical work on a rotating output shaft. It works by using a heat source to heat water into high-temperature steam, and the steam is then expanded through the turbine to rotate its blades and shaft.