What is the difference between a vessel sink and a pedestal sink?

A vessel sink is a sink that is shaped like a bowl (many options on the size and material) and sits on top of a pedestal or a bathroom vanity. A vessel sink can be easily removed and moved to a different bathroom or replaced with a different sink. A pedestal sink, however, is a set on its own, it comes attached to a base and cannot be removed, and it's a one piece item.