Hay bundles, also known as bales, are a common way of storing and transporting hay. Hay is a type of grass or legume that is cut and dried for use as animal fodder. Hay bundles are typically made by compressing the hay into a rectangular shape and tying it with twine or wire. The bundles are then stacked and stored in a barn or other structure until they are ready to be transported. Hay bundles are an efficient way to store and transport hay, as they can be easily moved and stacked.