QR is an abbreviation of the term Quick Response. As the term suggests, this is a code that enables fast data retrieval—it is used to transfer information from the offline world to the online world. By scanning a QR code with a smartphone, the user qets to the desired content quickly. The content can on a website, on social media, in an online PDF, or anywhere else online. QR codes also enable swift onlne payment through mobile banking. Access to Wi-Fi or mobile data is required to use QR codes. QR codes have the form of a square with smaller black and white squares, in which the required information is encoded.