IdP (Identity Provider)
Definition
An Identity Provider, or IdP, is a system that authenticates users and provides identity information to other services so they can grant access appropriately.
Examples
- An employee signs in once through the company's IdP and then accesses email, file storage, and HR systems without separate passwords.
- A cloud application trusts an external IdP to verify user identity before allowing access.
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Most organizations no longer rely on one single application. Users move between email, cloud storage, collaboration tools, internal portals, and many other services. If every service handled identity completely on its own, users would face many logins and administrators would struggle to manage them all. The Identity Provider helps solve that problem.
An IdP acts as a central source of trust for authentication. Instead of every application proving identity independently, applications can rely on the IdP to verify the user. This makes access management more consistent and often more secure.
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