please refer to External Trusts to Active Directory [1] from WIndows Integration guide, it nicely explains the difference between external trust and forest trust.

[1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/windows_integration_guide/active-directory-trust#ext-trust-to-ad

On Wed, Jun 9, 2021 at 11:09 AM Ronald Wimmer via FreeIPA-users <freeipa-users@lists.fedorahosted.org> wrote:
Quite some time ago I added a trust to another AD domain. IIRC I added
an "external trust" for a reason I do not remember.

What is the "Non-transitive external trust to a domain in another Active
Directory forest" trust type for? Could I not just have added another
"Active Directory domain" trust?

Any clarification on this matter would be highly appreciated!

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