A washer-dryer combo is a single appliance that combines both washing and drying functions. It allows users to wash and dry clothes in one machine, saving space and time. This type of appliance is particularly useful for small apartments or homes where separate machines may not fit. These units typically use a front-loading design and can handle various load sizes. They operate by washing clothes first and then transitioning to the drying cycle without needing to transfer the laundry. Many models also offer energy-efficient options, making them an eco-friendly choice for laundry needs.