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QR code: A silent genius in every cafe and on every ticket. How does it work?

We see them everywhere: on restaurant menus, on billboards, in mobile payments, and on boarding passes. These modest black and white squares have become an integral part of our lives.

But have you ever wondered what they are, where they came from, and how this "silent genius" works?

Contrary to popular belief, QR codes were not invented for marketing or cafe menus. They were born in 1994 in Japan, and their Toyota subsidiary created them to track spare parts in car factories.

The name QR itself is short for Quick Response, or "Quick Response." And this perfectly describes their essence.

In fact, a QR code is like a very advanced barcode, but it can store much more information because it is two-dimensional (2D).

  • The three large squares in the corners are the "eyes". They help your phone's camera navigate instantly, no matter what angle you scan the code from.
  • The small patterns inside are encoded information: a web link, text, contact information, or a Wi-Fi password.
  • The main superpower is error correction. Even if the QR code is partially damaged, frayed, or has dirt on it (up to 30% of the surface), your phone will still be able to read it. That's why they're so reliable.

Their popularity exploded for three reasons:

  1. Simplicity: you only need a smartphone, which everyone has.
  2. Versatility: they can store almost any information.
  3. Contactless: The pandemic has made them an indispensable tool for menus, payments, and tickets.

The QR code is a brilliant example of how simple and reliable technology can imperceptibly but dramatically change our daily habits. This is a great reminder for all of us: sometimes the most ingenious IT solutions are those that make complex things incredibly simple for the end user.

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