Well, for one, UDP brings the U. It's called the User Datagram Protocol because (at least on UNIX-like systems) unprivileged programs can almost always send and

Well, for one, UDP brings the U. It's called the User Datagram Protocol because (at least on UNIX-like systems) unprivileged programs can almost always send and receive UDP datagrams, but in general cannot send and receive raw IP datagrams.