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SSL/TLS is a technology used to encrypt traffic between the web server and a clients web browser. With an encrypted connection no man in the middle can spy on the data or change it while it is being sent between the client and the server.
You can easily see if a web page is using SSL/TLS by looking in the address bar of your web browser. If the address begins with https:// instead of http:// the connection is encrypted. Many browsers also mark it with a green padlock or similar in the address bar when the connection is over a secure SSL/TLS connection.
SSL (Secuer Socket Layer) and TLS (Transport Layer Security) are two different things. From the beginning it was called SSL and there were three different versions of it. When version four came to be launched they chose to change the name to TLS 1.0 (current version is TLS 1.3). Most people say SSL even though it really is called TLS now days.
Free SSL/TLS certificates are available with all of our hosting accounts through Let’s Encrypt.