vCard Tips & Tricks
A vCard is simply an electronic business card. It is a link or an attachment that contains the name, address and contact number of yourself or the person emailing you. Outlook, Yahoo, etc can understand vCards so that when you click on it, it will automatically add the contact details to your address book, saving you time retyping the details yourself.
Read more at: http://en.wikipedia.org/wiki/VCard or http://microformats.org/wiki/hcard
