Can someone explain to me in few words the difference between the associations and owners sub-tabs?

Can someone explain to me in few words the difference between the associations and owners sub-tabs?
Hi
Below are some information, Hope this helps:
Owners tab (client level only)
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The users or user groups who can access this client computer through the CommCell Console and who can run Web Console browse and restore operations on this client.
Association tab:
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Use this dialog box to add entities and roles to users and user groups. The users and user groups plus the roles plus the entity create the three-way security association.
Regards,
Pratik
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