In telecommunication, a communication protocol is a system of rules that allow two or more entities of a communications system to transmit information via any kind of variation of a physical quantity.
Daniel Julius Bernstein (sometimes known simply as djb; born October 29, 1971) is a German-American mathematician, cryptologist, and programmer.
In law and government, de facto (or;, "in fact") describes practices that exist in reality, even if not legally recognised by official laws.
Electronic mail (email or e-mail) is a method of exchanging messages ("mail") between people using electronic devices.
Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (email) transmission.