Google Drive

Google Drive is a featured app because it is an excellent cloud storage service. Documents, photos, audio, video and many other types of files are easily accessible and safely backed up  online. Other users can be invited to view, edit, and comment shared files and folders. Shared folders can be created for group work. Viewing files offline can be enabled. A free Google account is required. Google Drive is a paid app for the iPhone, iPod touch, and iPad.