Quick Response (QR) Codes are a type of 2D matrix barcode designed for fast readability and large storage capacity. QR Codes are used primarily in advertising materials as a way to track and encourage engagement.

From Wikipedia, an overview of the "Anatomy" of a QR code reveals how the codes are designed to be read from any angle, thanks to its Position / Alignment markers:

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QR codes are often encoded with a high degree of error correction, allowing for artistic embellishments and reading of imperfect code captures from a camera.

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