istio.io/content/en/docs/reference/glossary/trust-domain.md

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Trust Domain n/a

Trust domain corresponds to the trust root of a system and is part of a workload identity.

Istio uses a trust domain to create all identities within a mesh. For example in spiffe://mytrustdomain.com/ns/default/sa/myname the substring mytrustdomain.com specifies that the workload is from a trust domain called mytrustdomain.com.

You can have one or more trust domains in a multicluster mesh, as long as the clusters share the same root of trust.