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. These units are particularly popular in small apartments or homes where laundry space is limited. Typically, washer-dryer combos 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 to a separate machine. This convenience makes them an attractive option for those seeking efficiency in their laundry routine.