QR codes allow users to access webpages and other online content using the camera on their smartphone. A QR code is a type of two-dimensional barcode that can be read by QR reader apps. To use a QR code, a user scans it with their phone camera which then opens a link, downloads a file, or triggers another action. QR codes can support learning by providing additional content related to textbooks, presentations, assignments, and more. Some benefits are dynamic presentations and interactive textbooks. Limitations include requiring smartphone access and comfort with technology.