TLS is a proposed Internet Engineering Task Force (IETF) standard, first defined in 1999 and updated in RFC 5246 (August 2008) and RFC 6176 (March 2011).
It builds on the earlier SSL specifications (1994, 1995, 1996) developed by Netscape Communications Client-server applications use the TLS protocol to communicate across a network in a way designed to prevent eavesdropping and tampering.
In 2014, SSL 3.0 was found to be vulnerable to the POODLE attack that affects all block ciphers in SSL; and RC4, the only non-block cipher supported by SSL 3.0, is also feasibly broken as used in SSL 3.0.
SSL 2.0 was prohibited in 2011 by RFC 6176, and SSL 3.0 was also later prohibited in June 2015 by RFC 7568.
So, take a stroll down memory lane to remember all of our past Word of the Year selections.