An Analyzer report is a collection of fields and filters that is displayed in a specific report format. You can think of a report as a file, like a spreadsheet file, except that when you open a report or make a change, the report connects to your database so it displays the latest data. Reports are stored in a repository, so you can access reports from any computer.
When you create a new Analyzer report from the ground up, you select a data source first. The data source determines which fields will be available when you build your report. For example, if you choose orders as your analysis area, you most likely will see all fields related to orders.