What is Cross App SSO?

I am upgrading to essentials from free but see it doesn’t support Cross App SSO. What exactly is that? The tooltip says:
“Give your customers, partners and employees the freedom of Single Sign On while keeping the control and enhanced security you need”

I have no idea what that means. Can anyone explain?

I have the same question, My case I have 3 apps in auth0 and I want to be able to signing with my Auth0 username in the 3 apps

This question has been here for nearly a month without a response. Is there nobody at Auth0 who can answer this?

Can I use Auth0 for SSO without a paid subscription, or is this ‘Cross App SSO’ a feature of a paid subscription.

So it seems the answer is:
You can share the auth0 database for authentication across apps but they won’t be automatically logged in to other apps by logging in to one app unless you move to a paid plan (professional or enterprise).

The only SSO included with the free or essentials plan is social media login integration.