What is the purpose of a Stirling engine?

The purpose of a Stirling engine is to convert heat energy into mechanical work through a cyclic process. It operates by heating and cooling a gas, typically air or helium, within a closed system, causing the gas to expand and contract, which drives a piston. Stirling engines are known for their efficiency and ability to use various heat sources, including renewable energy. They are often utilized in applications such as power generation and refrigeration.