Google Drive is a cloud storage and Document creation system. Within Google Drive you have the ability to upload your files or to create Documents, Presentations, Spreadsheets and a lot more.
"Create new documents, spreadsheets, and presentations on your own or share and collaborate with others in real time. All your changes are saved automatically in Drive. There isn't even a save button. Open and edit Microsoft® Office documents, spreadsheets, and presentations on your phone or tablet."
Sheets or Spreadsheet has just recently been updated with a number of new / improved features;-
Learn more about Google Drive here