Another protocol for transmitting data securely over the World Wide Web is Secure HTTP (S-HTTP). Whereas SSL creates a secure connection between a client and a server, over which any amount of data can be sent securely, S-HTTP is designed to transmit individual messages securely. SSL and S-HTTP, therefore, can be seen as complementary rather than competing technologies. Both protocols have been approved by the Internet Engineering Task Force (IETF) as a standard.

See our "Do It Yourself SSL Guide" in the Did You Know...? section of Webopedia.
Also see "SSL: Your Key to E-commerce Security" in Webopedia's Did You Know...? section.

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