How do QR codes work?
Show answer & explanation
Answer: Patterns encode data in 2D
Patterns encode data in 2D ✓ — Correct! QR codes (Quick Response codes) encode information in a 2D pattern of black and white squares. Each square represents binary data (black=1, white=0). The three large corner squares help cameras orient the code correctly. The pattern can store thousands of characters - much more than traditional barcodes. Your camera captures the image, software decodes the pattern, and extracts the data (like URLs or text). QR codes also include error correction, so they work even if partially damaged!
Magnetic strips hold data — Wrong. QR codes don't have magnetic strips - they're just printed patterns. The information is visually encoded in the arrangement of black and white squares that cameras can read.
Holograms contain codes — Wrong. QR codes aren't holograms - they're simple 2D printed patterns. The black and white squares encode data that can be read by any camera without special 3D viewing technology.
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