vCard 
An industry-standard specification, maintained by the IETF, that defines a format for exchanging basic information such as a name, address, telephone number, e-mail address, and so on. The vCard specification defines a sort of electronic business card that can be sent via an e-mail attachment or as a link on a Web page. vCard recipients can easily add information to their electronic address books--as long as they're vCard-compliant.