A QR code is a square barcode that a phone camera reads to open a URL, used to move someone from something physical to something online.
Its only job is bridging the offline gap — packaging, posters, business cards, stage screens, shop windows — where typing an address is friction enough to lose most people.
Two failures are common and both are avoidable. Codes printed too small or on curved surfaces fail to scan, and codes pointing at a URL you cannot change later become permanently wrong. Pointing them at a page you control, rather than at a final destination, keeps them re-targetable forever.
Adding a short readable URL beside the code covers the people whose camera does not cooperate.
In practice
A code on a market stall sign pointing at your link in bio page can be redirected to a new product each season without reprinting the sign.
Common mistake
Encoding a campaign-specific URL directly. When the campaign ends, every printed code becomes a dead link.
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