QR CODES

 

A QR code (Quick Response code) is a two-dimensional matrix barcode that stores information, like a URL, a phone number, or contact details, which can be quickly accessed by scanning it with a smartphone's camera. Invented in 1994 by  Masahiro Hara of Denso Wave for the automotive industry, QR codes connect the physical world with digital information, making them useful for marketing, logistics, and connecting to web services, though users should be aware of potential security risks like tampering.
 

When you point your smartphone's camera at a QR code, a built-in scanner or a third-party app recognizes the pixel pattern. The code's finder patterns (three large squares at the corners) help the device determine the code's orientation and coordinate system, allowing it to decode the data encoded within the black and white pixel matrix. 

The decoded information is then used to trigger an action, such as opening a specific website in your browser, adding a contact, or connecting to a Wi-Fi network. 

Common Uses include Promoting events, sharing menus, or displaying coupons by linking physical objects to web pages or app content. 

Providing detailed information about products or facilitating tracking in supply chains.It is also used for Quickly sharing Wi-Fi credentials, contact details, or payment information. 

Cybercriminals can replace legitimate QR codes with malicious ones, redirecting users to harmful websites or services.

To stay safe, be cautious about the source of QR codes, especially when they are stickers or found on public surfaces. Some devices and apps have built-in security features that can alert you to potentially risky links.