Well-Known ID
A metadata endpoint provided by the IDP for "authentication (AuthN) and token exchange"
JWTs are typically issued as ID Tokens or Access Tokens, and to verify their signatures, you need to fetch the public key from the
jwks_uri (JSON Web Key Set). That jwks_uri address is defined in the well-known document. well-known endpoint → JWKS URI → fetch public key for JWT verification/.well-known
/.well-known/pki-validation
/.well-known/security.txt
/.well-known/apple-app-site-association
/.well-known/assetlinks.json

Seonglae Cho