Final answer:
To share both a project and its data, a .twbx file should be used. This Tableau packaged workbook combines the data and visualizations in a single file, unlike the .twb and .tde extensions.
Step-by-step explanation:
If you want to share your project with data, you should use the extension .twbx. The .twbx extension is a Tableau packaged workbook, which combines the information in a .twb (Tableau workbook) with any needed data sources. This single contained file is easy to share and doesn’t require the recipient to have access to the data sources used, making it ideal for sharing Tableau projects with data.
In contrast, a .twb file does not contain data, and a .tde file (Tableau Data Extract) contains only data, not the visualizations of data that a Tableau project would include. Therefore, to share both a project and its data, a .twbx file is your best choice.
Learn more about .twbx extension