Two-factor authentication provides unambiguous identification of users by means of the combination of two different components. These components may be something that the user knows, something that the user possesses or something that is inseparable from the user. A good example from everyday life is the withdrawing of money from a cash machine. O...
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http://en.wikipedia.org/wiki/Two_factor_authentication
Two-factor authentication is based on something a user knows (factor one) plus something the user has (factor two). In order to access a network, the user must have both 'factors' - just as he/she must have an ATM card and a Personal Identification Number (PIN) to retrieve money from a bank account, In order to be authenticated during the challenge/response process, users must have this specific (private) information....
Found on
http://www.encyclo.co.uk/visitor-contributions.php
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