Abstract
As digital systems cover all personal and professional activities, artificial intelligence is now everywhere. In this context, it is crucial for systems and decisions to be understandable for humans, in a human-in-the-loop process. This global objective is known as eXplainable Artificial Intelligence (XAI). In this chapter, we argue that fuzzy logic is a key concept for XAI as it offers a theoretical framework that is closer than many others to human cognition, human reasoning and human intuitions. We exemplify the many advantages fuzzy logic offers to the XAI domain.