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July 27, 2026Short & citedBlog
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How It Works • Technology

QR code

A QR code is a two-dimensional matrix barcode that stores data in a square pattern of black and white modules.

Updated July 27, 20261 min readCited sources

A QR code is a two-dimensional matrix barcode that stores data in a square pattern of black and white modules. The abbreviation QR stands for quick response, referring to how quickly the code can be read by a camera or scanner.

What it is

Invented in 1994 by Masahiro Hara at Denso Wave in Japan, the QR code was designed to label automobile parts quickly and reliably. Unlike traditional one-dimensional barcodes, it can be scanned from any orientation and holds more data, including text, links, and contact details.

How it works

A QR code encodes data in a grid of black and white modules. When scanned, a camera or smartphone captures the image, and software uses finder patterns and Reed–Solomon error correction to decode the information accurately, even if the code is partially damaged.

Why it matters

QR codes are widely used for website links, payments, check-ins, and Wi‑Fi access. In Canada, they appear on restaurant menus, transit tickets, and public information signs. They are not inherently unsafe, but users should verify the destination before opening links from unfamiliar codes.

In short

  • QR codes are square, machine-readable barcodes that can be scanned from any angle.
  • They store more data than traditional barcodes, including links and contact info.
  • Common uses include payments, tickets, and menus, especially in Canada.
  • Always check the destination before scanning an unfamiliar QR code.
Canadian angle

QR codes are widely used in Canada for payments, tickets, transit, public information, and restaurant menus, making them familiar to Canadian readers.

Quick questions

What does QR stand for?
QR stands for quick response.
How do I scan a QR code?
Open your smartphone camera or a QR scanner app, point it at the code, and follow the prompt on screen.
Are QR codes safe?
QR codes themselves are just encoded data, but they can link to unsafe websites or actions. Verify unfamiliar codes before opening them.

Sources

  1. Wikipedia — https://en.wikipedia.org/wiki/QR_code
    Supports: Definition, invention date, inventor, company, and error correction overview.
  2. GS1 US — https://www.gs1us.org/upcs-barcodes-prefixes/what-is-a-qr-code
    Supports: Two-dimensional barcode explanation and meaning of QR as quick response.
  3. Fortinet — https://www.fortinet.com/resources/cyberglossary/what-is-a-qr-code
    Supports: How QR codes work, common uses, and encoded data types.
  4. Britannica — https://www.britannica.com/technology/QR-Code
    Supports: General definition and character encoding description.
  5. IONOS — https://www.ionos.com/digitalguide/online-marketing/online-sales/what-is-a-qr-code/
    Supports: How to scan and create QR codes, plus QR meaning.
  6. Digital.gov — https://digital.gov/resources/introduction-to-qr-codes
    Supports: Scanning and creation options, including built-in browser features.
  7. Avast — https://www.avast.com/c-what-is-qr-code-how-to-scan
    Supports: Scanning with smartphones and cameras.
  8. Google TechTalks / YouTube — https://www.youtube.com/watch?v=5Kc-lDrWTzU
    Supports: Security caution that QR codes can lead to malicious webpages.