QR codes are barcodes that smartphones typically read. They are also two-dimensional and are in the shape of a square. QR codes can also be used for a bunch of things. One of the things they can do is taking you to a website. Another thing QR codes are able to do is show the user some text. A third thing they could do is compose a text message. Plus, QR codes can put a new contact in your address book. However, I actually didn't know that they could do those things (aside from taking users to websites).
Also, even though I've changed some words, the information about QR codes is based off of this link of a website about QR codes:
https://www.the-qrcode-generator.com/whats-a-qr-code
And here is a QR code that will take you to the homepage of this blog:
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