The Definition of Done provides guidance to the Development Team when forecasting their Sprint Backlog during the Sprint Planning, ensuring that they have a clear understanding of what is needed to complete the Increment (B). It also helps the team while working by giving them clear criteria on what needs to be achieved to have a potentially shippable Increment at the end of the Sprint (C). Additionally, it creates transparency and ensures a common understanding of the 'done' state of the Increment among all stakeholders during the Sprint Review (E). These factors together help maintain clarity, consistency, and quality in the Scrum process.