Senseo was one of the first coffee pod makers available. And having sold more than 10 million units in four years Senseo is definitely here to stay. A coffee pod looks just like a round tea bag. It works like this. You fill the coffee maker with water, place a coffee pod in the receptacle, hit the button and thirty seconds later you have a great cup of coffee. A patented method that uses a special spray head and mild pressure to balance the ratio of coffee to water while brewing creates a rich frothy cup of coffee.