How are mill machines different from steam engine machines?

Mill machines primarily focus on processing raw materials, such as grinding grain or milling wood, often using mechanical power derived from water or wind. In contrast, steam engine machines generate power through the combustion of fuel to heat water, producing steam that drives pistons or turbines. While mill machines are typically designed for specific production tasks, steam engines serve as general power sources for various applications, including transportation and industrial machinery. Overall, the key difference lies in their function and the energy source they utilize.