What is a QR Code?
A QR code (Quick Response) is a two-dimensional barcode invented in 1994 by the Japanese company Denso Wave. Unlike regular barcodes that can only be read in one direction, QR codes store information in two dimensions - vertically and horizontally.
How Does a QR Code Work?
A QR code consists of black and white squares arranged in a specific sequence. Each square position encodes one bit of information. Thanks to the two-dimensional matrix, QR codes can store much more data - up to several thousand characters.
Types of QR Codes
Static QR Code
Contains embedded information that cannot be changed after creation. Suitable for simple tasks: business cards, WiFi passwords, text messages.
Dynamic QR Code
Contains a short redirect link that can be edited at any time. Allows tracking scans and changing the target URL without reprinting the code.
How Are QR Codes Read?
Modern smartphones have built-in cameras with QR code recognition functionality. When pointing the camera at a code, the phone:
- Scans the image
- Recognizes the pattern
- Decodes the data
- Performs an action (opens URL, saves contact, etc.)