The term Token has three meanings, the first one is used with reference to networking. It means bits that are circulating on a token ring network. Only one computer can send data at any one time and it is the computer that has the token. The second meaning is to do with programming and a token is a single element, such as a punctuation mark, operator or reserved word which is part of programming language. The third meaning is to do with security systems and is an ID card that is needed to log into certain networks. When the user of the card enters a password the card then shows the current ID code which the user will need to log in. As this password will change around every 5 minutes it enhances the networks security.