TCP/IP

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Transmission Control Protocol / Internet Protocol

A foundational "layer" of the Internet -- this is the basic means of sending data between computers that protocols build upon (HTTP for the "web", or SMTP and POP and IMAP for email, for instance)

http://www.yale.edu/pclt/COMM/TCPIP.HTM

http://en.wikipedia.org/wiki/Internet_protocol_suite

IP, TCP, HTTP Nice overview of this "stack" of protocols central to modern networked data traffic