There can be as many admin users as required with different level of access and roles. The various roles ensure security to the store.
There are 3 types of admin roles in Magento 2:
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Account owner role
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Project-level roles
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Environment-level roles
Methods to Get Current Admin User Detail in Magento 2:
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Using Block
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Using Object Manager
Visit https://meetanshi.com/blog/get-current-admin-user-detail-in-magento-2/ for both the methods in details.