An embroidery hoop is a circular frame used to hold fabric taut while stitching. It typically consists of two rings, one that fits inside the other, allowing the fabric to be stretched securely. This tension helps prevent wrinkles and ensures that the stitches are even and neat. Embroidery hoops come in various sizes and materials, including wood and plastic. They are commonly used in embroidery, a craft that involves decorating fabric with needle and thread. Using a hoop can make the stitching process easier and more enjoyable for both beginners and experienced crafters.