A combine harvester is a large agricultural machine designed to efficiently harvest crops. It combines three main functions: reaping, threshing, and winnowing. This allows farmers to gather and process crops like wheat, corn, and soybeans in a single operation, saving time and labor. The machine features a cutting platform at the front to cut the crops, followed by a threshing drum that separates the grain from the chaff. The harvested grain is then collected in a storage tank, while the leftover plant material is expelled back onto the field. This technology has revolutionized modern farming practices.