An impeller is a device found in top-load washing machines that moves water and detergent around while clothes are being washed. It is a low-profile cone or disc that spins and rotates to rub clothes against each other to get them clean. Impeller washers use less motion and water than agitator washers, and they are gentler on clothes, reducing wear and tear. They also tend to be more energy-efficient, as they use less water and electricity than agitator-based machines. However, impeller machines may struggle with extremely soiled clothes, as their washing action is not as vigorous as agitators. Delicate fabrics might require extra care, as impellers may tangle or damage them during the washing process.