delegated authorization and federated authentiation

Hi,

In web services world when we use delegated authorization and federated authentiation. What are practical uses of them. Please advise
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gudii9Asked:
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EugeneZ ZhitomirskySQL SERVER EXPERTCommented:
see examples

"Sample delegation, federation, and authentication scenario in SharePoint 2013'
https://msdn.microsoft.com/en-us/library/office/ee538656.aspx

"Federated authentication allows a security token service (STS) in one trust domain to provide authentication information to an STS in another trust domain when there is a trust relationship between the two domains'

". A simple identity delegation chain usually consists of the information on the initial caller and the identity of the immediate caller."

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