What is SSL with HTTP?

Hypertext Transfer Protocol Secure (HTTPS) is a combination of the Hypertext Transfer Protocol and a network security protocol.

HTTP operates at the highest layer of the TCP/IP Internet reference model, the Application layer; but the security protocol operates at lower sublayer, encrypting an HTTP message prior to transmission and decrypting a message upon arrival.

HTTPS has also been known as "Hypertext Transfer Protocol over Secure Socket Layer", but now HTTPS may be secured by the Transport Layer Security (TLS) instead of Secure Sockets Layer (SSL) protocol.

To invoke HTTPS, one replaces "http://" with "https://" in the URI, or Web address.

HTTPS connections are often used for payment transactions on the Web and for sensitive transactions in corporate information systems.