What is an Unmanaged Dedicated Server?
An unmanaged dedicated servers is a server thatis going to be maintained by you and the hosting company will not help you with it. They are responsible for the physical hardware but everything else is left to you. Unmanaged servers are great for people that have technical expertise but for someone new to configuring Apache it can be a disaster.
Unmanaged servers are usually much cheaper than managed servers and its possible to hire a company to manage it for you if you are trying to save some money. Getting an unmanaged dedicated server and hiring a company to manage it can sometimes be cheaper than buying a managed server from the same hosting company.