According to wikipedia the QR code system was invented in 1994 by Masahiro Hara from the Japanese company Denso Wave. It was first designed to track the manufacturing of vehicles, also by allowing high speed scanning.
Basically, QR code works in the same way as barcodes work in supermarkets. It is a machine-scannable image that can instantly be read using a Smartphone camera. ... When your Smartphone scans this code, it translate that information into something that can be easily understand by humans.
How to Scan a QR code on an Android Phone
1. Press and hold the home button.
2. Then tap Lens.
3. Point your camera at the QR code.
4. Then tap the magnifying glass icon to scan the QR code.
5. Finally, tap the pop-up notification.
QR code can be adopt by individual, companies and the government for easy access to wifi passcode, for payment options, contacts details, links to websites etc.
You can get QR code scanner from Google play store and Applestore.
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