The integration of PropelAuth with Dash enables the creation of secure, interactive web applications that display data visualizations while ensuring data privacy based on user and team membership. By using PropelAuth's organization feature, developers can build dashboards, such as an NBA team stats dashboard, that restrict data visibility to only authorized users, exemplified by allowing only team members to view their respective team's data. The process involves setting up a Dash project, installing PropelAuth, and using a Kaggle dataset for player statistics, followed by filtering data based on team membership and creating visualizations through Dash's tools. This integration facilitates robust user management features, including registration, login, multi-factor authentication, and user impersonation, to enhance security and user experience, allowing developers to build applications with a balance of visualization power and secure authentication.