French press coffee maker is a brewing device in a cylindrical shape with a plunger and inbuilt filter that presses the hot water through the coffee and gives you a stronger and concentrated coffee. There are many types of French press coffee maker such as stainless steel, travel mug version, thermos flakes, etc.
A french press coffee maker works with a medium grinded coffee powder. The fined grounds of coffee powder is likely to seep through the press filter. French press maker is also used to make cold coffee. French press coffee maker tend to give the stronger and a slightly bitter taste coffee, because of this kind of taste people prefer french press coffee.
It does need little more patience then other coffee maker, but yeah if you want to have best fluffy and smooth coffee, it is the best way to get that.