The FileMaker Platform gives you plenty of options for exporting data out of your app. You can export files as text or even a separate FileMaker file but in our experience, the most common export format is Excel. It's pretty easy to export data out of FileMaker into Excel; the tricky part is customizing the headers of the exported data.
Why would you want to customize the headers? You may want to customize headers so that they're easy for the user to understand or to make them consistent with field names in other systems. For example, some of our developers like to group the "name" fields in a contact database by having them all start with the text "name" – nameFirst and nameLast instead of First Name and Last Name. So when we export that data natively from FileMaker, the column header will be nameFirst, not First Name. I won't get into why we do that here; that's a whole other blog post about field naming conventions.