PowerBI is a powerful business analytics tool developed by Microsoft. It offers interactive visualizations with self-service business intelligence capabilities. It provides a cloud-based BI service (known as "PowerBI Services") coupled with a desktop-based interface ("PowerBI Desktop"). It offers data warehouse capabilities including data preparation, data discovery, and interactive dashboards.

Companies seek individuals skilled with PowerBI for a variety of roles due to its ability to connect to a wide array of data sources, from Excel spreadsheets and on-premises SQL Server to cloud services like Azure SQL Database and Salesforce. Furthermore, PowerBI is capable of transforming data into visually appealing and interactive insights, which makes decision-making processes more data-driven and effective.

Proficiency in PowerBI typically requires a deep understanding of data manipulation and data visualization. Essential skills include creating and managing reports, dashboards, and workspaces in PowerBI for delivering data insights. Understanding Power Query for data transformation and Power Pivot for modeling data is also beneficial. Knowledge of DAX (Data Analysis Expressions) language will greatly assist in creating more complex formulas and building powerful data models.

Candidates wishing to master PowerBI would ideally have a firm grasp of data analytics concepts. Having foundational skills in Microsoft Excel is often viewed as beneficial due to the similarities between it and PowerBI, particularly on the formulation and data manipulation aspects. Other beneficial skills include a basic understanding of databases and SQL, statistics, data visualization principles, and business intelligence concepts.

So, if you are a data professional seeking to leverage your skills in a modern data sourcing and visualization tool, or a business professional aiming to drive business insights using data, PowerBI could be a skill worth mastering, adding a competitive edge to your profile in this data-driven market.