This website allows you to generate and scan QR codes. Let's breakdown what QR codes first. QR stands for quick response. QR codes are specific set of codes that once scanned give instant access to information, which explains the quick in quick responses. Think of QR codes like a barcode at the grocery store. Once scanned, the code gives the cashier the product information and price, each product has a unique code. QR codes are specific markings that are unique to whatever data the user selects. This code can be shared to give others instant access to  PDF’s , Video, images, etc. 
QR codes are a tool that can be used cross curricular, and at any age level. It is a very versatile tool and allows for endless possibilities for classroom, and personal use. There are essentially infinite uses with this tool.
I would use QR codes in the classroom for students to easily access in class if showing a demonstration on how to do an exercise or even when sending students home with work for them and the parents to use.

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