> For the complete documentation index, see [llms.txt](https://docs.teranode.group/tng-identity-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.teranode.group/tng-identity-documentation/tng-identity-sso/why-identity-sso.md).

# Why Identity SSO?

**Teranode Identity SSO** is an authorization server and a single sign-on service. It enables the use of Web 3.0 Identity with Web 2.0 technology stacks. The underlying tehcnology is the Identity Verifier service but SSO adds advanced authorization rules and single sign-on capabilities on top of the standard verification of Verifiable Credentials.  

Using SSO, client services can allow end-users to present their Web 3.0 credentials as a means of authentication in a manner compliant with OAuth v2 and OIDC standards. Additionally, it offers advanced configuration options for controlling what type of data clients can access.

Identity SSO integrates like other Identity Providers that support OAuth v2 and OIDC standards. However, the identity information is provided by end-users themselves through Verifiable Credentials, not by the SSO service. Standards support is implemented to simplify integrations with existing systems and user agents.