what is matrix type in a tabular Salesforce Report Format?

Hello Chanchal,
Matrix reports allow you to group records both by row and by column. These reports are the most time-consuming to set up, but they also provide the most detailed view of our data. Like summary reports, matrix reports can have graphs and be used in dashboards.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 compare values in several different fields, or you want to look at data by date 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.
Thanks.