Streamlit is a versatile tool for creating interactive web applications using Python, easily integrating with libraries such as pandas and numpy to build "data apps." Its user-friendly nature allows developers to implement interactive features without complex coding concerns, though it has limited built-in authentication options. PropelAuth can enhance Streamlit's authentication capabilities by hosting necessary UIs for features like signup, login, and two-factor authentication, as well as providing an authentication proxy to manage secure user data exchange. While setting up PropelAuth, developers need to configure local environments and integrate the service with Streamlit using provided libraries and APIs. For production, an authentication proxy can be deployed using Docker, ensuring that user access is securely managed while Streamlit applications remain protected from unauthorized access.