DAX aggregate functions include standard functions and aggregate functions.
In standard functions,we have SUM, MIN, MAX,and Count, etc
In DAX aggregate functions we have SUMX, MINX, MAXX and CountX etc.
All the functions X at the end are called iterative functions that execute row by row.
For more to learn, visit https://www.learndax.com/
You can learn more and about Power BI DAX and can download data at https://www.learndax.com/ Power BI Training & Power BI Analytics