QR codes were created by Denso Wave in 1994 in Japan as an improvement on bar codes, they weren't able to be used by smartphones until 2002. QR codes contain much more information than a bar code and can be scanned more easily.
They could hold data such as url links, text, phone numbers, and coordinates. QR codes have an error correction capacity, so even if they are damaged they may still be able to be scanned.
Generating a QR code is easy. There are many websites that offer to create free ones. For example the QR code pictured at the top of this post was generated at http://qrcode.kaywa.com/ and links to my other blog.
QR codes can be scanned using an application on smartphones. There are more than one out there but Kaywa also offers a QR code reader as well as generating them.
QR codes are a way to connect print to digital. They are very beneficial for a business to include in their advertisements and other printed material for customers to connect to the website.
Sources: http://qrcodeguide.org/14/qr-codes-%E2%80%93-history-and-technical-background/
http://searchengineland.com/what-is-a-qr-code-and-why-do-you-need-one-27588
http://qrcode.kaywa.com/
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