Video chapters split an upload into labeled sections with their own preview. YouTube’s help guide says creators can type timestamps themselves or allow automatic chapters when a video is eligible. Manual chapters override the automatic ones.
For viewers this is a study tool. A 40-minute tutorial becomes a table of contents: jump to the error you hit, replay the wiring step, and ignore the intro. Chapters also appear in some transcripts, which makes scanning easier.
Creators benefit when the map is honest. A chapter named “Install the driver” is more useful than “Part 3.” People who land on the right section are more likely to stay, and they can send a friend a precise moment instead of “around minute 18.”
Not every video gets automatic chapters. Channels with strikes, or videos that may be inappropriate for some viewers, can be left out. You can also opt out in Studio if you prefer a single continuous bar.
If you watch to learn, open the chapter list before you press play. If you publish to teach, write the first timestamp at 0:00 and keep each section long enough to be a real stop—not a decorative label.