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Office's new web apps come from the Office Store, where you can purchase add-ins or install free tools.
Office Web Apps
Your Office 2013 subscription comes with either SkyDrive or Office 365 support, which means you get access to a new version of the Office Web Apps, as well as 20GB of additional online storage for your files.
Word Web App
The new Office 365 web apps take much of the Office 2013 user interface and translate it to the web — even the backstage view.