A QR code, or Quick Response code. A square-shaped barcode sometimes found on CBD product packaging. QR codes are scanned with a phone camera to link to a webpage or PDF. Some CBD brands attach the lab results or COA for that batch on the product.
The CBD in your skincare could be inferior is if it is not tested by a third-party lab. A reputable company should always have a Certificate of analysis or third-party, independent lab testing available to you somewhere on their website or by request.