Reporting is a powerful source of information and a means to group your Contacts for targetted Marketing.
Custom reports can be created to include standard and custom fields. You can include/exclude Groups and Groups can be created from Reports and you can export to csv.
You have the choice of Custom reports, Static reports, Contact reports or Business reports.
N.B whichever you choose from Custom, Contact or Business, the end result is a report of your Contact data.