can someone explain the different ways coffee eon be ground up and how the various coffee makers work?

at the store i noticed that the coffee grinds has many different settings- how do all these different coffee makers work? i understand the one which uses a one-way valve to pomp coffee up a vertical tube so the hot water then drips onto the coffee grounds but that is The only one i know. Thanks.
but how do these different machines work? how can coffee be made other then dripping water over the grounds ?