What is an SSL Certificate? | DigiCert
https://www.digicert.com/what-is-an-ssl-certificate
WebSecure Sockets Layer (SSL) is a standard security technology for establishing an encrypted link between a server and a client—typically a web server (website) and a browser, or a mail server and a mail client (e.g., Outlook). It is more widely known than TLS, or Transport Layer Security, the successor technology of SSL.
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