The full form of QR Code is Quick Response Code. It’s used on Computing ,General Computing in Worldwide

A quick response (QR) code is a type of barcode that can be read easily by a digital device and which stores information as a series of pixels in a square-shaped grid. QR codes are frequently used to track information about products in a supply chain and often used in marketing and advertising campaigns.

QR codes are considered an advancement from older, uni-dimensional barcodes, and were approved as an international standard in 2000 by the International Organization for Standardization (ISO)

Next to being used for linking to share links, QR codes can contain other types of information:

• A QR code on a business card can contain an electronic version of the contact information. Scan the code and the reader application adds the contact to your address list.
• A QR code can contain event information. Scan the code on a poster for a concert and the app automatically adds its name, date, and location to the agenda on your smartphone or PC.
• A QR code can contain an SMS with a phone number and text. Scan the code and the scanning app lets you automatically participate in some contest to win fabulous prices.
• A QR code can contain an e-mail message with a subject and message text. That message can be a request for information so that in return you might get a reply email with additional information and attached files.
• A QR code can contain a geographical location. Scan the code on a poster advertising for a restaurant and its location becomes available to your navigation software, informing you how to get to that place.
• A QR code can contain WIFI configuration data. Scan the code and your Android device automatically configures itself to use the wireless access at the hotel.