vCard & QR code

vCard

vCard is a file format standard for electronic business cards. vCards are often attached to e-mail messages, but can be exchanged in other ways, such as on the World Wide Web or Instant Messaging. They can contain name and address information, phone numbers, e-mail addresses, URLs, logos, photographs, and even audio clips.

from Wikipedia
http://en.wikipedia.org/wiki/VCard

Data in the vCard format is stored in a plain text file which is formatted according to the vCard specification; these files typically use the .vcf extension. The vCard files are properly recognized by the vast majority of applications and mobile devices.

QR code

A QR code (short for Quick Response) is a specific matrix barcode (or two-dimensional code), readable by dedicated QR barcode readers and camera phones. The code consists of black modules arranged in a square pattern on a white background. The information encoded can be text, URL or other data.

from Wikipedia
http://en.wikipedia.org/wiki/QRcode

Data in the QR Code format is shown as an image (two-dimensional barcode, as opposed to the one-dimensional barcode printed on most consumer goods). Many mobile devices are able to scan and interpret QR Codes codes. This barcode can store any kind of data, from arbitrary text to structured data such as geographical positioning data and contact information. Contact information displayed in the QR Code format allow users to scan the data directly into the mobile device without having to manually transcribe it.