Trivial File Transfer Protocol, a very basic form of FTP, introduced in 1980. Small memoery footprint. TFTP uses port 69 UDP. Often used to boot computers over the network that dont have their own local harddisk (thin clients) or in embedded devices. Cannot list directories, doesnt have any authentication or encryption.
RFC 783 (The TFTP Protocol (Revision 2))
RFC 1350 (The TFTP Protocol (Revision 2))