SSL stands for Secure Sockets Layer, and it was the original version of the encryption protocol that we use to secure our connections to this day. We got all the way to SSL 3.0 before vulnerabilities forced the industry back to the drawing board, where Transport Layer Security (TLS) was designed to be SSL’s successor. Today we are on TLS 1.3, SSL 3.0 has been almost entirely deprecated and by 2020 TLS 1.0 and 1.1 will be deprecated, too. While today’s internet relies almost exclusively on the TLS protocol, it’s still colloquially known as SSL.