https

It's a secure option for using the Web. If you're shopping online or doing transactions on a banking site for example, you should see https in the address bar, it means you're using secure http.

HTTPS is similar to HTTP. The main difference being that, HTTP uses port 80, while HTTPS uses port 443 by default. It also has an additional encryption/authentication layer in between HTTP and TCP. This was designed by Netscape, and is widely used on the internet, esp. in websites which deal with financial transactions and other confidential data.

Https is Hyper Hext Transfer Protocol Secure is just another version http with more security . this option always with signed a lock.maybe like e-gold or others.

Hypertext Transfer Protocol (HTTP) is a method used to transfer or convey information on the World Wide Web. Its original purpose was to provide a way to publish and retrieve HTML pages.

Development of HTTP was coordinated by the World Wide Web Consortium and the Internet Engineering Task Force, culminating in the publication of a series of RFCs, most notably RFC 2616 (1999), which defines HTTP/1.1, the version of HTTP in common use today.

HTTP is a request/response protocol between clients and servers. The originating client, such as a web browser, spider, or other end-user tool, is referred to as the user agent. The destination server, which stores or creates resources such as HTML files and images, is called the origin server. In between the user agent and origin server may be several intermediaries, such as proxies, gateways, and tunnels.

An HTTP client initiates a request by establishing a Transmission Control Protocol (TCP) connection to a particular port on a remote host (port 80 by default; see List of TCP and UDP port numbers). An HTTP server listening on that port waits for the client to send a request message.

Upon receiving the request, the server sends back a status line, such as "HTTP/1.1 200 OK", and a message of its own, the body of which is perhaps the requested file, an error message, or some other information.

Resources to be accessed by HTTP are identified using Uniform Resource Identifiers (URIs) (or, more specifically, URLs) using the http: or https URI schemes.

~~http://en.wikipedia.org/wiki/HTTP~~

Https: Full form Hyper Text Transport Protocol Secured . This is a Form of Web Url which has Security features and is especially useful for Financial/ Credit Card Transactions or other Important information which you would not like to be easily hacked or seen by someone else (especially Criminal minded crackers ) .

E.g - Gmail can be accessed on:
https://gmail.google.com

HTTP is an application. (Hyper text transfer protocol) with the help of this we are able to use inter net. is a communication protocol that enables Web browsing.

use this link to know about http:
http://en.wikipedia.org/wiki/Http