This is a kubectl plugin for Kubernetes OpenID Connect (OIDC) authentication, also known as kubectl oidc-login.
Here is an example of Kubernetes authentication with the Google Identity Platform:
Kubelogin is designed to run as a client-go credential plugin. When you run kubectl, kubelogin opens the browser and you can log in to the provider. Then kubelogin gets a token from the provider and kubectl access Kubernetes APIs with the token. Take a look at the diagram:
