This diagram shows the relationships between OAuth and OIDC. OAuth is an consent and token based authorization standard/framework which allows third-party applications to access data in one application without sharing password and other credentials. OIDC builds on top of that with additional features like identity token (JWT) and profile information. OIDC is commonly used in SSO (Single Sign-On) scenarios.
References
An Illustrated Guide to OAuth and OpenID Connect | Okta Developer
