Final answer:
The use of QR Codes to retrieve marketing information is a type of mobile marketing, which targets users on mobile devices through various channels.
Step-by-step explanation:
The use of Quick Response codes (QR Codes) to retrieve marketing information is an example of mobile marketing. Mobile marketing is a multi-channel online marketing technique focused at reaching a specific audience on their smartphones, tablets, or other mobile devices, via websites, email, SMS and MMS, social media, and apps. In the case of QR codes, these are often used to conveniently provide information straight to the user's mobile device when they scan the code. This method is particularly effective due to the prevalence of mobile devices and enables marketing teams to provide customers with personalized and direct marketing.