Centrifugation is used when we want to separate small amounts of suspension. The suspension of solid in liquid is poured into a centrifuge tube, then spin around very fast in a centrifuge. The spinning motion forces the solid to the bottom of the tube. Then the liquid can be poured off from the solid.
Centrifugation is commonly used in dairies to separate milk from cream to make skimmed milk. It is possible because milk has less density than cream.
The idea of centrifugation is applied in washing machine for drying clothes. There are many small holes in the washing drum in a washing machine. After the washing is completed, the washing will then rotate at high speed, this will forces the water on the wet clothes out through all the small holes.