A harvesting machine is a type of agricultural equipment used to harvest crops. The two most common types of harvesting machines are the thresher and the REAPER. A thresher is an agricultural machine that separates grain from the chaff and straw. It is usually powered by a tractor or other engine. A REAPER is a machine that cuts and collects grain, such as wheat, oats, barley, and rye. It is typically powered by a motor or a horse. Both machines are essential for efficient and effective harvesting of crops.