A dedicated server is a single computer in a network reserved for serving the needs of the network. For example, some networks require that one computer be set aside to manage communications between all the other computers. A dedicated server could also be a computer that manages printer resources. Note, however, that not all servers are dedicated. In some networks, it is possible for a computer to act as a server and perform other functions as well.
A dedicated server is a server to which you are the only one that has access to the files, and you control the contents of the entire server. You are not sharing space with anyone else, nor can anyone else get to your data.