Burr grinders are the most commonly used grinders in cafés. They are also gradually taking over from blade grinders in the domestic market. The advantage with burr grinders is that the grind can be regulated to suit the kind of coffee you are making. For plunger coffee you need a coarse grind for filter and espresso a finer grind. Beyond that gross distinction between the kinds of coffee making there is also the importance of getting the grind for your particular coffee machine just right. In a café the barista may reset the grind several times a day to keep the coffee extraction perfect.
Below a picture of a typical burr grinder - the bodum bistro. This is similar to a commercial grinder except that all the parts are smaller and lighter and it is not designed to run continuously in a commercial environment.