Power BI is a business analytics service and data visualization tool developed by Microsoft. It enables users to create interactive and visually appealing reports and dashboards that can be shared with others across an organization. Power BI allows businesses to connect to various data sources, transform raw data into meaningful insights, and make data-driven decisions.

Key features of Power BI include:

1. Data Connectivity
2. Data Transformation and Modeling
3. Data Visualization
4. Dashboards
5. Natural Language Queries
6. Collaboration and Sharing
7. Mobile Accessibility
8. Data Alerts

Power BI comes in several versions, including Power BI Desktop (a free standalone application for creating reports and dashboards), Power BI Pro (a subscription-based version for individual users), and Power BI Premium (a capacity-based licensing model designed for organizations with multiple users and advanced features).