TLS is Next Generation SSL
When people talk about SSL(Secure Socket Layers) protocol, what they actually mean is TLS(Transport Layer Security). TLS is the successor and the new name of SSL.
SSL 3.1 is actually TLS 1.0. TLS 1.1 is SSL 3.2 and TLS 1.2 is SSL 3.3. TLS 1.3 is the latest version proposed on 21 March 2018.
Now that you know these, let’s get into TLS.