QR code, which means fast information flow, is a type of barcode that can be read through special matrix characters through the cameras of mobile devices. It can be easily used on mobile phones via QR code reader software, the content of which can be a text, video link or website address. It has a content that is usually in the form of a square and consists of black patterns on a white background. It has the ability to store much more information than traditional barcode content.