QR codes can be used to reach out to people with a phone. They are great for any company trying to promote their products or appeals. Items such as coupons, one-time deals, and more can all be marketed through this technique. QR codes can also be used for marketing and advertising. Companies can place them in various locations such as magazines, billboards, and posters. QR codes are also placed on products and are typically a URL to a company's website.