Use single sign-on (SSO) for Office resources
Connect using REST and OAuth
Choose new APIs
The preview release of our new Office 365 APIs extend the platform that we introduced in Office 2013 to support the ability for both websites and native applications to consume Office 365 data.
The story of apps
What are apps for SharePoint?
Apps are small, easy-to-use, stand-alone applications that solve a need for your users or business.
Site owners can install, upgrade, and uninstall them on their SharePoint sites without farm or site collection admins.
What are apps for Office?
Apps are web applications that extend what a document, email message, or meeting request can do in Office.
Run them in multiple environments like Office desktop applications, Office Online, and mobile browsers—in the cloud or on your site.
Why create apps
Extend the way you create and use information from Office and SharePoint.
Use any hosting services to run and deploy them.
Or sell them in the Office Store.