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It is now officially a dead parrot and must not be used henceforth by order of the great and good (and, in this case, the eminently sensible).
It went through various iterations and is now at version 3 (dating from 1995) and used in a variety of clientserver applications.
When a secure connection is initially established it will, depending on the implementation, negotiate support of the particular protocol from the set SSLv3, TLSv1, TLSv1.1 or TLSv1.2.
Such is the pervasive power of the name SSL that in most cases what is called SSL is most likely using TLS - for instance Open SSL supports both SSL (v3) and TLS (TLSv1, TLSv1.1 and TLSv1.2) protocols.
The main repository for RFCs is maintained by the IETF, text versions (the normative reference) may be viewed at org/rfc/rfc or (where XXXX is the 4 digit RFC number - left padded with zeros as necessary).
Currently published RFCs are pointed to https:// XXXX which contains various information and links to the text (normative) reference and a PDF (non-normative) version. The major use of SSL (X.509) certificates is in conjunction with the TLS/SSL protocol.