Hay-bundling machines, also known as balers, are machines used to compress hay into bales for easier storage and transportation. They are typically powered by either a tractor or an electric motor, and can be used to bundle hay, straw, cotton, and other materials. The bales produced by these machines are usually rectangular in shape and can be tied with twine or wire. Hay-bundling machines are commonly used on farms and ranches to store and transport hay for livestock feed.