In general, a cognitive bias is the thinking pattern that occurs because of the way we process information and this thinking pattern develops accordingly due to our own preferences and experiences. They can cause us to behave irrationally without noticing it. And it is used in marketing to a ridiculously frightening effect. It's important to understand it, how it affects us and how you can use it as well. 

Learn more here: https://www.sambuno.com/integrating-cognitive-bias-social-media/