Netlify Identity service brings a full suite of authentication functionality, backed by the GoTrue API. This allows you to manage and authenticate users on your site or app, without requiring them to be users of Netlify or any other service.
To enable Identity service on your site, select the Identity tab and select Enable Identity.
This will create an Identity service instance for your site, and allow you to invite Identity users and change settings. To use the service in your site, you can add the Netlify Identity widget to your repository, or develop a custom solution with the gotrue-js library.