Retractable leashes are a type of dog leash that allows for adjustable length, giving pets more freedom to explore while still being under control. They consist of a strong cord that extends and retracts into a plastic casing, enabling the owner to lock the leash at a desired length. This feature is particularly useful for walking in open areas where dogs can roam safely. These leashes often come with a brake mechanism, allowing the owner to quickly stop the dog from moving further away. However, it's important to use them responsibly, as they can pose risks in crowded spaces or around other animals. Proper training and awareness are essential for safe use.