What do you call a computer or device connected to a network that provides services?

The term that accurately describes a computer or device connected to a network that provides services is "host." In networking terminology, a host refers to any device that communicates over a network and can provide services to other devices. This definition encompasses servers that host applications, resources, and data, enabling other devices to access those services.

In contrast, a "node" generally refers to any point of connection within a network, which can include things like routers and switches as well as hosts. "Device" is a broader term that refers to any electronic component, which might not necessarily be providing services to the network. "Client" typically refers to a device that accesses services provided by a host or server, rather than being the provider itself. Hence, the proper identification of a device providing services on a network correctly aligns with the term "host."