There are three task-status levels: To Do, Doing, and Done. When someone signs out a story, everyone knows who’s working on it. And everyone knows when it’s done. And because the board has sticky notes that represent everything that needs to be done in a single Sprint, everyone knows how the Sprint is going. Anyone can walk into the room, glance at the board, and know exactly how the team is doing.
In the digital age, the Scrum board has to be visible online. People are not usually meeting in a physical space.