A CI may be any object that is affected by a related change request. CIs are classified into types, categories, and subcategories. A simple example is a server. A server is a hardware node, and the service to be implemented may be carried out on it. Another example is an application. An application is simply a collection of software objects, residing on a server, that may be affected by the originating service request. Configuration items may be related to any number of other configuration items.