A Personal Online Datastore (POD for short). It plays several roles -- firstly, it stores a user's data (and so acts as a Resource Server). In many cases, it also hosts the user's WebID Profile, and implements the API endpoints that allow it to act as a WebID-OIDC Identity Provider (OP).
WebID Profile can specify any OP with solid:oidcIssuer, since WebID Profile has to stay public any RS can host it, it doesn't even require RP if one edits it out of bound and doesn't rely on WAC for that.
https://github.com/solid/webid-oidc-spec#pod
WebID Profile can specify any OP with
solid:oidcIssuer
, since WebID Profile has to stay public any RS can host it, it doesn't even require RP if one edits it out of bound and doesn't rely on WAC for that.