Salad spinners, also known as salad dryers, are kitchen utensils used to remove excess moisture from freshly washed salad greens. They consist of a perforated bowl, usually made of plastic, that can be sealed with a lid or cover. After placing the wet greens inside the bowl, users can manually spin or rotate the inner basket, causing centrifugal force to push the water outwards and collect in the outer compartment. This process efficiently dries the salad leaves while keeping them crisp and ready for consumption.