title: Multi-provider authentication layman terms
body: <p>I'm trying to understand what the library <code>OmniAuth</code> does so first I want to see if I understand "multi-provider authentication" correctly. Does this just mean that your app can use either facebook, or google as different types of providers to authenticate you as a user? Thus you can login into your app by providing your facebook id/pw OR your google id/pw and both will take you to the same account under your app?</p>