REDIRECT_FIELD_NAME from django.contrib.auth

In my class-based django view, I am using redirect_field_name = REDIRECT_FIELD_NAME. May I know where I am redirecting to, and also by default, what is the field name and how I can set it? Thank you

def zulip_login_required(
        function: Optional[ViewFuncT]=None,
        redirect_field_name: str=REDIRECT_FIELD_NAME,
        login_url: str=settings.HOME_NOT_LOGGED_IN,
) -> Union[Callable[[ViewFuncT], ViewFuncT], ViewFuncT]:
    actual_decorator = lambda function: user_passes_test(
        logged_in_and_active,
        login_url=login_url,
        redirect_field_name=redirect_field_name,
    )(
        zulip_otp_required(
            redirect_field_name=redirect_field_name, login_url=login_url,
        )(add_logging_data(function))
    )

    if function:
        return actual_decorator(function)
    return actual_decorator  # nocoverage # We don't use this without a function