What is a QR Code?

A QR code is a square matrix barcode that encodes data such as URLs, login tokens, or text and can be scanned quickly by device cameras.

When to use QR Codes?

- Passwordless login, device pairing, or quick sharing flows

- Bridging physical contexts with digital destinationsWhen not to use QR Codes?

- In low‑light, long‑distance, or obstructed scanning conditions

- When sensitive data could be exposed without additional verificationWhat is the anatomy of a QR Code?

- Error correction level (L, M, Q, H)

- Version and module density

- Quiet zone and contrast requirements