A .tblk file is a Tableau Bookmark file. Tableau is a powerful data visualization and business intelligence software used for analyzing and presenting data in an understandable and visually appealing manner. A bookmark file in Tableau (.tblk) is essentially a shortcut or a pointer to a specific worksheet, dashboard, or story within a Tableau workbook (.twb or .twbx). It allows users to quickly access and share specific views or analyses without having to navigate through the entire workbook. The bookmark file stores information about the specific view, including filters, sorts, and other customizations. When a user opens a .tblk file, Tableau opens the associated workbook and navigates directly to the saved view. This is particularly useful for sharing specific insights or analyses with colleagues or for quickly accessing frequently used views within a complex workbook. It's important to note that the .tblk file itself does not contain the actual data; it only contains the instructions on how to display a specific view within the workbook. Therefore, the associated workbook must be accessible for the bookmark to function correctly.