Drip-brewed, or filtered, coffee is brewed by hot water passing slowly over roasted, ground coffee beans contained in a filter. Water seeps through the ground coffee, absorbing its oils, flavours and essences, solely under gravity, then passes through the bottom of the filter. The used coffee grounds are retained in the filter with the liquid falling (dripping) into a collecting vessel such as a carafe or pot. Paper coffee filters were invented in Germany by Melitta Bentz in 1908. To reduce waste, some coffee drinkers use fine wire mesh filters, which can be re-used for years. Many countries in Latin America and Africa traditionally prepare drip coffee using a small reusable bag made of cotton or other cloth.
Moka coffee is coffee brewed with a moka pot, a stovetop coffee maker which produces coffee by passing hot water pressurized by steam through ground coffee at a lower pressure than an espresso maker. The moka pot is an Italian invention, first produced by Bialetti in the early 1930s. The flavor of moka pot coffee depends greatly on bean variety, roast level, fineness of grind, and the level of heat used. Due to the higher-than-atmospheric pressure involved, the mixture of water and steam reaches temperatures well above 100 °C, causing a more efficient extraction of caffeine and flavors from the grounds, and resulting in a stronger brew than that obtained by drip brewing.