SSL and TLS are really the same protocol, except that newer versions are called TLS. Many software stacks still refer to both as SSL, but these days we only use TLS.

My understanding is that the renaming was mostly politics between Microsoft, Netscape, and the IETF in the 90s. See more details here: http://tim.dierks.org/2014/05/security-standards-and-name-ch...