And the answer is? Hay is basically a variety of grasses that are cut, dried, and used as fodder, mainly for farm animals. Straw is hollow stalks of grain (such as wheat), used mostly as bedding and garden mulch, but which is also used as feed. There. Goodnight. And OOB. U REDZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ see ya in Cardiff.