In modern marketing language “Call to Action (CTA)” is a banner, button or some type of graphic or text on a website, meant to prompt a user to click it and continue down the track which a consumer takes through an Internet advertising or search system, navigating an e-commerce website and finally converting to a sale. An example of this is a QR (Quick Response) Code which is a matrix barcode (or two-dimensional code), readable by QR scanners, mobile phones with a camera, and smartphones. The code consists of black modules arranged in a square pattern on white background. The information encoded can be text, URL or other data. Its success can be measured via a conversion rate formula.