!!! Overview
[{$pagename}] is the means of [Identity Correlation] a [Digital Identity] and [Identity Attributes] stored across multiple [distinct identity systems|Security Domain] to form a [Digital Subject].[1]

[{$pagename}] is typically performed through an [Identity Correlation] and or [Identity Broker] for a [Federation].

A [{$pagename}] creates a [Digital Subject] which is the combination of all of an [entity]'s [Digital Identity]s within the [Digital Context] and may include [Identity Attributes] from one of more [Security Domains].

[{$pagename}] allows, assuming there are no agreements to the contrary, the [Identity Provider (IDP)] to perform as a [Identity Broker] using the attributes of the [{$pagename}].

[{$pagename}] are created from a [Federation] of one or more [Identity Provider (IDP)] by some form of agreement or by an agreement of the [Entity] using [Social Login].


!! [{$pagename}] 
[{$pagename}] saves businesses time and resources in managing [Digital Identities|Digital Identity], and prevents [End-User] from having to create and manage a new [UserId]/[password]. 
For example, you can use your [social media account login|Social Login] to access your fitness tracker account. In effect, the social media company is vouching that the same person is logging in each time they access the tracker website.

[Identity Brokers] help facilitate this process by managing the integration between organizations and [Credential Service Provider]. Organizations connect once to the [Identity Broker] and accept many types of [credentials], rather than managing each integration separately. However, this process presents [Privacy Considerations] for users as these connections can create the opportunity for an exposure of [Private data], or for the [Identity Broker] or [Credential Service Provider] to [track] a user’s online activity.

!! Federated Identity Examples:
* [SAML]
* [OpenID Connect]
* [Social Login]
* [WS-Federation]
* [Spy Organizations]
* [Identity Brokers]

There are many commercial options available; however, most of these options use one or more of the options discussed.

!! [Privacy Considerations]
[Privacy-Enhanced Identity Brokers] describes the technical challenges unique to integrating [Privacy Enhancing Technologies] ([PETs]) within [Identity Federation Frameworks].

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [http://en.wikipedia.org/wiki/Federated_identity] - Retrieved 2013-03-30