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Is there a difference between a dedicated server and a dedicated virtual server, or do these two terms mean the same thing?
A dedicated server is a single physical server that's dedicated to one person.
A virtual server is a server that's running within virtualization software on a physical server. There are multiple virtual servers within a single physical server. These are also known as "virtual private servers", or VPSs.
I dislike the term "dedicated virtual server" because it's misleading.