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An Identity Provider (IdP) is a service that centrally manages digital identities and provides authentication and attributes to applications. It supports single sign-on, federated identity and centralized access control using standards such as SAML and OpenID Connect. It is key to secure, scalable access architectures.
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An identity provider (IdP) is a trusted service that verifies identities and tells other applications that a sign-in succeeded.
Identity providers evolved from centralized directory and login services so one identity could be used across multiple applications. Federation protocols such as OpenID Connect turned that arrangement into a standardized exchange between an IdP and a relying application.
Picture the IdP as an identity office: it authenticates a person and issues the application a signed ticket containing relevant claims. The application validates the ticket without receiving the password.
The IdP checks whether a sign-in belongs to an identity.
An application trusts an identity assertion made by another service.
Tokens carry verified data such as a user identifier or role.
The concept separates sign-in from application authorization. That supports SSO architecture, trust decisions, and troubleshooting of tokens and claims.
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