i really dont get what this is. is it not web based auth? why are VPNs obsolete? this does not co-exist with VPNs? how is this different from , say, shiboleth o

i really dont get what this is. is it not web based auth? why are VPNs obsolete? this does not co-exist with VPNs? how is this different from , say, shiboleth or other saml or sso schemes?