Introduction
Power BI uses DAX to do calculations because it helps create fast and flexible formulas. This lets you analyze data easily and get answers quickly without changing the original data.
When you want to add new numbers like totals or averages to your report
When you need to filter data dynamically based on user selections
When you want to create calculated columns or measures that update automatically
When you want to compare data across different time periods like months or years
When you want to build interactive dashboards that respond to clicks and filters