vCard is a file format used for electronic business cards. Usually it is attached to email messages with information like the name, address, telephone numbers, email addresses, company logos, and photographs. It also may contain sound clips and geo-positioning information. With vCard, your subscribers can easily add your sender information to their address book. In this case the information is displayed in the following way:
The following is an example of a vCard file containing information for one person:
All vCards begin with BEGIN:VCARD and end with END:VCARD. All vCards must contain the VERSION property, which specifies the vCard version. VERSION must come immediately after BEGIN, except in the vCard 2.1 standard, which allows it to be anywhere in the vCard.
You can read more about vCard properties here.