> For AI agents: [llms.txt](https://docs.trustedauth.com/llms.txt) provides a Markdown index of this documentation.

# OAuth and OIDC foundations

Use this section to build a practical foundation in OAuth and OIDC for IDaaS.

## Topics in this section

[📄️Basics Core concepts and terminology](/docs/applications-and-sso/oidc/oauth-oidc-foundations/oauth-oidc-basics.md)

[📄️Examples and tokens This page contains practical OAuth and OIDC examples, including end-to-end flow summaries, token sets, and sample token payloads.](/docs/applications-and-sso/oidc/oauth-oidc-foundations/oauth-oidc-examples-and-tokens.md)

[📄️Token validation This page explains how to validate OIDC ID tokens and OAuth access tokens and summarizes recommended security practices.](/docs/applications-and-sso/oidc/oauth-oidc-foundations/oauth-oidc-token-validation-and-best-practices.md)

[📄️Enhanced security This page describes OAuth and OIDC security extensions that harden authorization requests, token issuance, and token usage.](/docs/applications-and-sso/oidc/oauth-oidc-foundations/oauth-oidc-enhanced-security-features.md)