The deployment phase involves publishing Power BI reports and dashboards to the Power BI Service or an on-premises server. Power BI developer configure access controls to ensure data security and set up data refresh schedules. They test the solution in the live environment, addressing any performance or compatibility issues. This phase may also include integrating reports with existing applications or embedding them into portals. Successful deployment ensures that users can access the solution seamlessly. By prioritizing reliability and scalability during deployment, developers help organizations leverage the full potential of their Power BI solutions.