A security token or an authentication token is a small hardware device that the owner carries to authorize access to a network service.The security token acts as a electronic key which provides access to something and is used in addition to or in place of a password to verify one's identity.
The user of a security token has a personal identification number(PIN) which authorizes the user as the owner of the device, and the device too displays a number which uniquely identifies the user to the service,allowing the user to log in.The user identification number is usually changed in every 5 minutes or so.
A security token is a physical object which makes it different from a password.It is in the form of a smart card or may be embedded in a commonly used object such as a key chain.
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