What is a WiFi QR code?
A WiFi QR code is a standard QR code that holds three pieces of information: your network name (SSID), the password, and the encryption type. When a phone scans it, the operating system reads those details and offers to join the network — so nobody has to read out or type a long password. It's the same technology behind the QR codes on posters and packaging, just pointed at your router instead of a web page.