What does multi-site WordPress application mean?

You would need to contact the super administrator if you want more capabilities however here’s a summary.

Super Admin – somebody with access to the site network administration features and all other features.

Source http://codex.wordpress.org/Roles_and_Capabilities

The capabilities of the site administrator role are reduced in a WordPress Network. Site admins cannot install new themes or plugins and cannot edit the profiles of users on their site. Only the Network Admin (Super Admin) has the ability to perform these tasks in a WordPress network.

Your site is part of a multisite network using the same domain and your site address is a sub domain.

http://codex.wordpress.org/Multisite_Network_Administration

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