In fully automatic washing machines, once you choose your required wash program, it automatically chooses the correct wash cycle, fills in the required amount of water needed, rinses the clothes, drains the water, and eventually does the spinning to extract around 96% of the water from the clothes. All of this is done in the same drum. Unlike in the semi-automatic washing machines.
There is no hassle of transfer clothes from one drum to another, or draining the water, or filling the requisite amount of water like in a semi-automatic. Semi-automatic machines are considered to be labor-intensive. They lack appealing features, they come in only top-load options and are generally more affordable. However, from an energy-saving perspective, both fully automated and semi-automatic machines are similar.
You will also find that mostly the tubs in a semi-automatic machine are made out of plastic, whereas the tubs in most fully automatic machines are made out of metal (or alloy like stainless steel). A metallic tub is usually more durable.
For more information about fully automatic washing machines, please refer to our Top 5 Affordable Best Front Loading Washing Machine in India.