Matrix reports are similar to summary reports but allow you to group and summarize data by bothrows and columns. They can be used as the source report for dashboard components. Use this type for comparing related totals, especially if you have large amounts of data to summarize and you need to comparevalues in several different fields, or you want to look at data bydate and by product, person, or geography. Matrix reports without at least one row and one column grouping show as summary reports on the report run page.