Dropbox is a popular file-sharing service that allows users to sync their files across multiple devices. The author of the text expresses frustration with recent changes to the Dropbox app, which has started to show notifications in the app itself instead of the native file browser on Windows or Mac. However, these changes can be easily mitigated by adjusting the preferences to open folders in the native file browser. This allows users to continue using their preferred method for managing Dropbox files and keeping the app out of their way.