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In the past that are three types of espresso machine, steam, piston and pump. Steam driven espresso maker are the simplest because to the small number of moving parts needed in it. Piston driven espresso makers uses manual power to pressurized the hot water, this is where the phrase “pull” a shot comes from. Pump driven espresso maker are the same as Piston driven ones just that this is driven by a motor. This function makes it popular in coffee bars in the past as it doesn’t require that much man power to operate it. As technology improves, modern espresso machine just requires a push of a button and a minute for a hot cup of espresso.