Reporting
Your Force.com application may focus on collecting data from your users, but your users will gain the greatest benefit from reporting on the information stored in the Force.com database.
Reports are based on a report type. A report type defines the data that is available for the report. A user can create a report as a standard report, a report with summary information or a matrix style report. Selection conditions, record order and summary totals can be defined for a report. A user can save a report for future re-use.
You can define your own custom report types, to include data from multiple related objects, or to present a limited set of data field options for your users.