Basics

A Brayton cycle ( Jet Engine ) Optimized for Rotary Power Production rather than Thrust
Can be used for Propulsion ( Turboprop / Turboshaft ) or for pumping fluids (Turbine Driven Pumps in Flood Control or Turbine Driven Pumps in Oil and Natural Gas Extraction + Refining), or for Electrical Generation
They have the Advantage of Energy Efficiency*, Reduced Part Count , and High Power Density
- This comes at the cost of increased design (ie not finished device, but the planning / design process / modeling) complexity, and Precision Required (See Turbine Balancing )
They can be "Fuel Agnostic" to an Extent, however anything with a high Ash Content should be avoided due to the issue of Abrasive Turbine Wear

Gas Turbine