A square barcode that stores information and can be scanned with a smartphone camera. Like a digital business card that contains links, contact info, or other data.
Restaurants use QR codes on tables that you scan with your phone camera to instantly view their menu online.
A QR Code is a data format (2D barcode standard), not a cloud provider service. Cloud platforms commonly support generating QR codes in apps (via libraries) and scanning/decoding them using mobile devices or computer vision services, but there is no single direct equivalent service named “QR Code” in AWS, Azure, Google Cloud, or OCI.