A co-op is a group of homeschool families who pool their teaching — one parent leads science, another art, another writing — so children get group classes, labs, and friendships a single home can't easily provide. Some are small and free; others are larger, structured, and charge tuition for hired instructors. They're one of the main ways homeschoolers build community and cover subjects a parent would rather not teach alone. About Time's Co-op Finder helps you find ones near you.