Deeplinking allows users to link to any file in a Repl, as well as specific lines and columns within that file. By copying the URL of their current location, users can easily share their project with others. The feature also affects browser history, allowing users to navigate back to the last file viewed. Additionally, users can add line or column numbers to the URL for more precise links, such as linking to a specific line in a file. This feature is expected to be expanded to include named deeplinks in the future.