QR codes are two-dimensional barcodes that can be scanned by mobile devices to link to webpages or other online content. QR codes can be easily created using free online generators by inputting a URL and downloading the QR code image. QR codes provide benefits for education by allowing reduced copying costs, increased student engagement with materials, and more learning opportunities through mobile access within the classroom. Teachers can use QR codes for activities like treasure hunts and listening comprehension exercises.