Dryer sheets are thin fabric sheets coated with softening agents and fragrances. They are added to the dryer during the drying cycle to help reduce static cling, soften clothes, and impart a pleasant scent. The sheets work by transferring these agents to the fabric as they tumble in the heat of the dryer. In addition to their primary functions, dryer sheets can also help reduce wrinkles and make ironing easier. Some people use them for other purposes, such as freshening up drawers or repelling insects. However, it's important to note that they may not be suitable for all fabrics, especially those that are moisture-wicking or flame-resistant.