Hi @aosberg_american-equity_com , the key difference between the Organization admin and the site admin is that the Org. admin can manage the whole setting in the organization which includes all the site admin priveledges and beyond. While the site admin is not able to access other sites related to the whole organization.
You can take a look at this documentation; https://support.atlassian.com/user-management/docs/give-users-admin-permissions/
for more insights.
Let me know if you have any more questions.
Here is an article that might help - how-do-jira-permissions-work
in cloud you have Jira admin and project admin. Then there is the Technical contact that is defined with Atlassian as well as a billing contact but these are separate from admin permissions.
Org and site admin terms are often thrown around, Including myself I’m afraid.
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