The document discusses single sign-on (SSO) for mobile applications. It notes the growth of smartphones and tablets and how users now access work applications from multiple devices. This has led to challenges around authentication and access management across different platforms and applications. The document explores existing SSO methods and standards like SAML and OAuth that aim to provide a common authentication mechanism. It introduces the concept of a "token agent" native mobile application that can obtain access tokens on behalf of other applications to enable SSO functionality and help address issues like separate authentication flows and access token management for each individual application.