Semi-automatic washing machines are a type of washing machine that requires some manual intervention during the washing process. They typically consist of two tubs: one for washing and another for spinning. Users need to fill the washing tub with water and manually transfer clothes to the spinning tub after washing. These machines are generally more affordable and consume less water compared to fully automatic models. They offer flexibility, allowing users to control the washing time and water levels. However, they require more effort, as users must handle the water filling and draining processes themselves.