- An open standard and decentralized authentication protocol. Promoted by the non-profit OpenID Foundation, OpenID allows users to be authenticated by cooperating sites (known as relying parties, or RP) using a third-party service, eliminating the need for webmasters to provide their own ad hoc login systems, and allowing users to log into multiple unrelated websites without having to have a separate identity and password for each. Users create accounts by selecting an OpenID identity provider and then use those accounts to sign onto any website that accepts OpenID authentication. ← Wikipedia ↑ openid.net
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