It is an immersion method of brewing, where coffee grounds are steeped in hot water.
It typically consists of a cylindrical beaker, a lid, and a tight-fitting plunger with a fine mesh filter.
The plunger is pressed down to separate the brewed coffee from the grounds, trapping them at the bottom.
The resulting brew is often full-bodied and rich because the method allows oils to remain in the coffee that a paper filter would remove.