Security
SSL
Abbreviation for Secure Sockets Layer
In short and in plain language
SSL is an old way to keep data private.
It guards the path between a browser and a website.
Today people mostly use its successor. The old name stayed, though.
A certificate with this name usually goes with a site that has a safe link.
Definition
SSL is an older method for encrypting data sent between a browser and a website. Today its successor TLS is mostly used, but the name SSL has stuck. An SSL certificate usually belongs to a website that can be reached via HTTPS.