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Encoded, not encrypted. Anyone with a scanner can read the contents. Don't put secrets in a QR code unless the data itself is encrypted first.
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Higher error correction = more redundancy. A code with H (~30%) can still be read with up to ~30% of it damaged or obscured. Use H for printed codes; M is fine for screens.
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Camera scanning is local. The camera feed is processed frame-by-frame in your browser — it never leaves your device.
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Common uses: sharing URLs, Wi-Fi credentials, contact cards, Bitcoin/Lightning addresses, Hive usernames, Nostr npubs, v4call links.