A sticker chart is a chart on which moments of success become visible with symbols or pictures. The card helps see back what succeeded when, without stickers being the main focus.
Example: after a successful potty moment, a child sticks one symbol on the card. At the end of the week, you can see at a glance how it went.
This is how it helps: seeing what succeeded gives guidance and language. The map is temporary and stays simple, so that attention stays with the moment itself.