A Tableau Bookmark File (.tbm) is a file format used by Tableau, a popular data visualization and business intelligence software. It essentially saves a snapshot of a specific view or worksheet within a Tableau workbook. This allows users to quickly access and share specific analyses or visualizations without having to navigate through the entire workbook. The bookmark stores information about the data source connections, filters, calculations, and formatting applied to the view. When a .tbm file is opened, Tableau recreates the saved view, connecting to the original data source and applying the stored settings. This is particularly useful for sharing specific insights with colleagues or for quickly accessing frequently used views. Bookmarks can significantly improve workflow efficiency by eliminating the need to repeatedly recreate complex visualizations. They are also helpful for maintaining consistency in reporting and analysis across different users and projects. The file itself is typically small, as it only contains the instructions for recreating the view, not the actual data.