Marketing collateral is a term that few people discuss these days despite the fact that it represents an ongoing trend that has been around for decades. And, it will continue to be in the mainstream as long as people will engage in marketing, digital or otherwise. While few people discuss the term, many engage in collateral without even knowing they do so. This is why the concept needs to be defined and explain before moving further with the topic. With this article, I will try to shed some light on the subject and at the same time, pinpoint some of the main reasons to treat it with the utmost respect and attention.