Design and develop a real-time data visualization dashboard that provides a comprehensive view of key business metrics. The dashboard should allow users to easily monitor and analyze trends, identify outliers, and make informed decisions. It should support multiple data sources, including databases, APIs, and cloud services. The dashboard should be highly interactive, allowing users to filter, sort, and customize the data visualization. Ensure cross-browser compatibility and responsive design for optimal accessibility. Implement robust security measures to protect sensitive data.