A Dedicated server, means that you are dedicating a server only for your purposes.
This server is not shared with anyone else, and it’s resources are only for your use and purposes. Mostly what you get from a hosting service is servers as part of the same machines (same hardware) where you get a set of resources as you define them, and they might be a part of a stronger machine, where you get only a part of it, and that machine might serve other servers, and other resources.
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The Dedication part means that the server is solely yours, and the definitions you require for it, like bandwidth, security, resources and other configurations that you have requested, will be dedicated to you, so you will always have them available.