A cafetière is the coffee pot with a plunger. You put ground coffee and hot water in a jug, wait, then push a metal mesh filter down so the grounds stay at the bottom. In British English this is the ordinary name; Americans almost always say French press. It is not an espresso machine, not a paper-filter drip pot, and not a moka pot on the stove — no steam, no paper, just a mesh you press. In French, cafetière can mean a coffee pot more broadly; the English borrowing is this plunger pot in particular. The French spelling and the accent make it feel a little posh in English, though the object itself is homely.