Neurodivergence is the idea that some brains function differently than the "typical" brain, and that these differences should not necessarily be considered a mental illness. In the past, we may have considered autism, for example, to be an inherently bad or abnormal condition that needed to be treated like other mental illnesses.
As we come to learn more about how the human brain works, and the differences that can occur from person to person, we now look at the topic of neurodiversity in a completely new light. The more we learn, the more we can push back against the stigmas that have harmed many individuals in the past.