QR Codes as Mobile Technologies

http://www.qrcode.com/en/about/
and
https://en.wikipedia.org/wiki/QR_code#Mobile_operating_systems 

 QR codes seem to be everywhere, and are used for many purposes. Everything from identifying products, conveying menu calorie information, and now, even funerary purposes on headstones. What do QR codes stand for?  QR codes means Quick Response codes. The code was named so because its purpose was to be read quickly. A QR code is a symbol that can encode 300 alphanumeric characters. According to (Wikipedia, 2017) " A QR code consists of black squares in a square grid on a white background." (See the example above). 

It can handle many types of data, such as numbers, a alphabetic characters, Kanji, and Kama symbols, binary, and control codes. QR codes are readable from any direction, 360 degrees. It completes this through detection patterns located at the three corners of the symbol. There are many applications  for QR codes. They can carry information both horizontally as well as vertically. They have a high capacity for encoding of data.

The history of QR codes seems to be somewhat unclear. According to Wikipedia, 2017, QR codes were developed for the Japanese automotive industry. In yet another source, QR codes.com, they were created  for the Japanese supermarket industry to help make check outs more efficient and more manageable. The bar code had its limits.  QR codes can store approximately 7,000 characters which can be images, sounds stored as binary data. QR codes can be incorporated into the classroom to provide links to resources, complete diagrams and images, and solutions can be coded and made available to students. This is a useful way to incorporate mobile technology into the classroom and use it for learning.