ID tokens, typically formatted as JSON Web Tokens (JWT), are a crucial element in the authentication process, particularly for verifying user identity in modern web security frameworks like OpenID Connect (OIDC). Unlike access tokens, which grant access to resources, ID tokens authenticate the user's identity and provide user profile information. When a user logs in through an identity provider, an ID token is issued to the application, enabling it to confirm the user's identity and personalize their experience. The tokens contain claims such as the user's name and email, and are used in various scenarios including single sign-on (SSO) and federated authentication, where seamless authentication across platforms is required. ID tokens are indispensable in ensuring secure and efficient digital identity validation, and platforms like Descope offer tools to simplify their management, enhancing authentication and authorization capabilities in web and mobile applications.