SSL/TLS
Both Secure Socket Layer (SSL) and Transport Layer Security (TLS) are security protocols. Nowadays, HTTPS communication uses only TLS but the name SSL/TLS has remained. Its purpose is to encrypt data using a key and an encryption algorithm to make it unintelligible. This protocol is based on the principle of certificates, used to authenticate official sites, to guarantee optimal security. Once the certificate has been validated, the two entities agree on a new private key and a protected "socket" is set up between the two.
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