Retractable leashes are a type of dog leash that allows for adjustability and control while walking your pet. The leash is typically made up of two parts - a retractable cord, which extends and contracts as needed, and a handle or grip that the owner holds onto. This design provides more freedom for the dog to roam and explore without being too far away from their owner. Retractable leashes come in various lengths and styles, allowing owners to choose the best option for their specific needs and preferences.