Let's say my research in my lab is focused on using MRIs to explore the neural circuitry of the regulation of emotions.
If I start in Academic Search Premier with a search for neural circuitry AND MRIs and emotions, I get articles only from academic journals:
If I broaden the search to neural circuitry and emotions and limit to Magazines, I get four articles that discuss the topic for non-experts.
If I look at the second article, I find a discussion of the topic that helps someone understand the importance of my research without discussing it specifically. It's situating my research in a broader context and allow a non-expert to engage in a discussion of it.