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, making it ideal for small spaces like apartments or homes without a separate laundry room. These units typically use less water and energy compared to traditional washers and dryers. The washer dryer combo operates by washing clothes in a drum, then automatically switching to a drying cycle. While they may take longer to dry clothes than separate machines, their convenience and compact design make them a popular choice for those with limited space.