Google Drive is absolutely one of the essential tools in your teaching digital tool kit. Using Google Drive you can have both a cloud storage service available for you anytime anywhere together with a powerful productivity suite that includes tools to write a document, create a drawing, build a presentation, or make a spreadsheet. Now with the syncing functionalities Google introduced lately, you can start a document or presentation on your desktop and finish it in school on your iPad. For me personally there is nothing that beats it even Dropbox and Evernote are not as practical as Google Drive ( personal view ).
Coutesy of edudemic.com