The Google Drive As WordPress CDN (Content Delivery Network) Plugin automatically syncs your static files (like images) to your own Google Drive Account. From there the files are delivered to the users who visit your webpages. This reduces the load of your webserver and can decrease page load time as well.
Google announced that web hosting in Google Drive will be deprecated. You can continue to use this feature (and this plugin) until August 31st, 2016, but after that, googledrive.com/host/ID will no longer work. Note that due to this fact, this plugin will no longer be supported and further developed after 01.09.2016.