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Security Token Service Definition: A Security Token Service (STS) is a web service that issues security tokens and enables authentication and authorization in a distributed environment using standards like SAML and OAuth.
A Security Token Service (STS) is a web service that issues security tokens to clients for use in authenticating and authorizing access to resources in a distributed environment, typically in a federated identity management system. STS generates security tokens that contain claims about the user, which can be used by services to make access control decisions. The tokens issued by STS are commonly based on security protocols like Security Assertion Markup Language (SAML) or JSON Web Token (JWT).