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What is a vCard and how to use them
http://www.askbigpapa.com/articles/393/1/What-is-a-vCard-and-how-to-use-them/Page1.html
By Rodney Goldston
Published on 06/19/2008
 
You can use email to easily exchange vCards with others. A vCard, or "virtual card," contains your contact information, such as your address or phone number.

What is a vCard and how to use them
What is a vCard
vCard serves as an electronic business card. It is a convenient way of exchanging personal information such as name, address, phone number, and e-mail address.

How to add a vCard in Microsoft Outlook
With Outlook, you can automatically convert a vCard that was received from an external source to an Outlook Contact record. If the vCard arrives as an e-mail attachment, you can double-click the vCard attachment and then click Save And Close to add it to your default Contact folder. Alternatively, you can create a Contact from a vCard by dragging it to the Contacts folder. 

How to add a vCard in Apple Mail
To add a vCard someone sends you to Address Book, double-click the vCard icon in the message.  Address Book opens and displays the new card.