Hay is food for cows, horses, and other farm animals. It is made by harvesting and drying grass, clover, or other plants. Think of it like making a super-duper tall pile of your favorite snack, like Cheerios or crackers, but instead of eating it yourself, you give it to the animals to eat. Hay has long, thin stems and lots of leaves that the animals can munch on, and it's a good way for farmers to make sure their animals are healthy and strong. Plus, it's nice and crunchy!