QR codes are two-dimensional barcodes that can be scanned by smartphones to link to web-based content like websites, videos, or text. Educational institutions are using QR codes to engage learners by placing them around their facilities linked to welcome messages, safeguarding information, or interactive tools. Teachers can print QR codes for homework assignments that students can scan later to access content, or place codes around classrooms linked to supplemental videos. Creating and scanning QR codes is free using various online tools and apps.