Static QR codes, like the one above, are typically used to disseminate information to the general public. They are often displayed on posters and billboards and in ads in newspapers and magazines. The person who created the code can track information about the number of times their code was scanned and whether or not the code's call to action was taken.
Dynamic QR codes (sometimes referred to as unique QR codes) offer more functionality. They can be edited at any time and even target a specific individual for personalized marketing. Such codes contain more metadata to facilitate tracking.