Microsoft Power BI is a business analytics service provided by Microsoft that allows users to connect to various data sources, transform and visualize data, and share insights across the organization. Power BI is part of the Microsoft Office suite of products and is designed to help businesses make data-driven decisions by providing interactive and customizable dashboards and reports.

Key features of Microsoft Power BI include:

1. Data Connectivity: Power BI can connect to a wide range of data sources, including Excel spreadsheets, SQL Server databases, SharePoint lists, cloud services like Azure, Salesforce, Google Analytics, and many others.

2. Data Transformation: Users can clean, shape, and transform data using Power Query Editor, a powerful ETL (Extract, Transform, Load) tool. This allows users to perform data cleansing, merging, and calculations to prepare data for visualization.

3. Data Visualization: Power BI offers a variety of visualization options, such as charts, tables, maps, gauges, and more, to represent data in a visually appealing and meaningful way. Users can create interactive reports and dashboards that allow for drilling down into specific data points for deeper insights.

4. Power Query and Power Pivot: Power BI is built on the foundation of Microsoft Excel, so users familiar with Excel will find some similarities in functionality. Power Query and Power Pivot, which are also part of Excel, are integral components of Power BI, enabling data modeling and transformation.

5. Power BI Service: The Power BI service is a cloud-based platform where users can publish their reports and dashboards. It allows for collaboration and sharing among team members and stakeholders, making it easy to distribute insights across an organization.

6. Power BI Desktop: Power BI Desktop is a Windows application that provides a rich environment for creating and designing reports and dashboards. It is used to create reports and models before publishing them to the Power BI service.

7. Power BI Mobile: Power BI offers mobile apps for iOS and Android, allowing users to access their reports and dashboards on the go. The mobile app enables users to stay connected to their data and make informed decisions, even when away from their desks.