trust relationship

Definition
A trust relationship is

"allows users of one system to freely access other systems in the relationship, as if those others ystems were simply extensions of the users home system."

Overview
"Thus, a hacker who gains access to one system in such a relationship can then access all the other systems that trust it. While trust relationships are of great practical importance when working in a networked environment, they need to be carefully managed because of the risk they pose."