Bimodal IAM is a type of authentication that uses two forms of credentials to access enterprise information. It uses internal and external credentials, where the internal credential is a stable form of identity like a password or biometric scan set up within the organization, and the external credential is more dynamic and uses outside accounts that the user already has, like social media or email, to verify identity.
Bimodal IAM takes pre-existing enterprise identity architectures and adds the layer of the external credential. The pre-existing external credential relieves the enterprise of the responsibility of managing more identity data. Typically bimodal IAM will only allow users access to less valuable enterprise data.