What exactly is WordPress?

  1. Yes, you can run WordPress with your own domain if you purchase hosting for it.
  2. WordPress has system of Roles (which can be further enhanced via plugins), you can let users register and allow to perform actions accordign to their role.
  3. Essentially yes. You copy WordPress files to server and initiate brief installation procedure.
  4. First account will be created during installation (if I remember right latest WordPress version will ask to specify login/password).
  5. CPU usage will be proportional to pageviews and amount of functionality you implement in your WP site.
  6. WordPress has no forum functionality natively. There are third party plugins to implement/integrate it and sister project bbPress (but it currently goes through some rough patch and is being heavily refactored).
  7. WordPress is tailored to be highly compatible with different hosting environments. Hostgator not only supports but explicitly recommends WordPress for blogging sites.

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