Types of Access Token in Facebook

There are 3 Types of access token in FaceBook.

APP access tokens

Are used to get information that your app is privileged to access from the Facebook Graph API. And in some cases where publish_stream is granted from an app user, you can use it to post to that user's wall, without needing a USER access token.
USER access tokens

Are given to your app and they relate to the permissions a specific app user has granted to your application so you app can act on their behalf when interacting with the Facebook Graph API.
PAGE access tokens

Are given to page admins so they can act on behalf of the page. To go from a user access token to a page access token, call /me/accounts using the user access token to get a list of pages they admin along with each pages access tokens.