YouTube Chapters are sections defined by the video's publisher and provide guides to the location of specific content within the video. Not all publishers provide them since it allows people to skip other sections and could reduce the time spent watching the video and possibly their revenue as well.

But people like me, who publish mainly to help and guide their viewers, probably do use chapters.

But there is a small secret. If you are using Google to search for something, it provides a handy insight into the YouTube videos that use chapters. Here is a quick video to show you how to use the chapters function directly from your search results.