Once it is enabled, this App adds Export choices in several places:
For every export provided by this App, you can choose between the Excel spreadsheet format (.xls) or a comma-separated values (.csv) format. If you intend to use Excel, then the former is the best choice, while the latter is easy to parse so it is a good fit for ad hoc processing.
By default, CSV values are surrounded by double quotes and separated by commas, but this can be changed to any other character when exporting your data.
Exports are also available from the REST API.