How to filter by using a formula in ExcelThe FILTER function in Excel is a powerful, dynamic array function (Excel 365, 2021 ) that extracts matching data from a range or table based on specified criteria, automatically updating results and resizing the output array as data changes. Its basic syntax is =FILTER(array, include, [if_empty]), where array is the data, include is your logical test (e.g., ColumnA=H1), and if_empty is an optional value if no matches are found, like