Jet Basics NAV for Microsoft Dynamics NAV is a business reporting tool that's meant to let users create high-impact reports in a familiar environment, such as Microsoft Excel. With Jet Basics NAV (formerly Jet Express for Excel), you can use all Excel capabilities, such as formatting, slicers, charting, and pivot tables.
The following is a product definition by the vendor:
"An extension included with Microsoft Dynamics NAV to give users a simple way to create basic reports and business queries inside of Excel".
Note that this is a free version of Jet Basics NAV. There's also a paid version of Jet Basics NAV (named Jet Reports) that you can purchase, so a lot of the functionalities have been stripped out of the free version; there is also a version that allows you to create reports in Microsoft Word ...