 This paper describes some underlying principles of multi-component and high entropy alloys, and gives some examples of these materials. Different types of multi-component alloy and different methods of accessing multi-component phase space are discussed. The alloys were manufactured by conventional and high-speed solidification techniques, and their macroscopic, microscopic and nanoscale structures were studied by optical, x-ray and electron microscope methods. They exhibit a variety of amorphous, quasicrystalline, dendritic and eutectic structures. This article was authored by Brian Cantor.