Using Office365Online_Office_Online_apps are launched by selecting a document to view or edit from the One_Drive page in the Office_365_portal, or from locally-hosted enterprise versions of the Office web apps on a SharePoint_2013 site.
Selecting a document automatically starts the Office Online App that is associated with the file.
Office_Online includes commonly-used edit functions.
To access more advanced features, users must either edit the document in an already existing Office installation, such as Office365ProPlus, or launch Office on Demand from the Office Online application