The Bialetti Moka stove top is an iconic device that debuted in the the early 1930's. Bialetti has made over 200 million of these in the years since and it has become the benchmark for stovetop the world over.
The Moka pot is designed to force water vapor through ground coffee to produce Italian espresso in minutes. With air and coffee oils interacting with this intensity, a velvety crema forms a layer atop the rich espresso.
Easy to use and clean and great travelling buddy too.