A common complaint about Google Docs, now accessed via Google Drive, is the requirement of being online. Previously Google gave offline capability to the word processor app, Docs, to allow Chrome and Chrome OS users to work without connectivity. Now Google has added offline editing, creation, and presentation functions to the Slides app.
The new offline capability is rolling out today and requires the use of the Chrome browser or Chrome OS to enable the functionality. Users can not only work on presentations in Slides while offline but present them as well. This eliminates the worry of having working Wi-Fi at the presentation venue.
Google promises to add offline capabilities to the Sheets app to bring it up to speed with Docs and Slides. No word on when that may happen.