In what ways is static electricity useful explain a practical use?

Static Electricity is very useful in many things we use in our everyday life. For instance, Photocopiers use static electricity to give the image or text a charge. The toner and the image have opposite charges because opposite charges attract. Static Electricity is also used in the ink. It makes the ink attracted to the places in which the information we need to be printed on the paper not where its supposed to stay white.