Gmail email was Google's first cloud service. They expanded beyond that to Google Docs, which allow you to create and edit word processing, spreadsheets, presentations and other types of documents. Other people can collaborate on these documents too. You can also upload any type of document to Google Docs, even if it cannot edit it. By placing it there, you can treat it as a backup or a way to move big files between computers, or to have them available when you're not at your regular computer.