A QR code, short for Quick Response code, is like a special barcode that smartphones and QR readers can read. It looks like a bunch of black squares on a white background. You can use these codes to store many different things, like messages, website links, or other info. Just scan the code with your phone to see what’s inside.

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QR codes, first made in 1994 by a Japanese company called Denso Wave, were initially used for tracking car parts during manufacturing. But they’re handy and can hold more info than regular barcodes, so now they’re used everywhere.

In marketing and advertising, companies put QR codes on posters and ads. When you scan them, they take you to websites, give you coupons, or tell you more about products.

Some systems let you scan a QR code to pay quickly and easily for payments.

Airlines and event organizers use QR codes for boarding passes and tickets. You scan them with your phone for a quick check-in.
QR codes are also great for sharing stuff. You can share contact info, connect to WiFi, or even use them on resumes to show your online portfolio or LinkedIn profile.

QR codes can give you more info about what you’re seeing or learning about in museums or schools.

Now that most phones have cameras, QR codes are super popular. They’re quick to read and hold much more info than the old-style barcodes.