Final answer:
A server is a network device that primarily provides information and resources to other devices on the network.
Step-by-step explanation:
The term used to describe a network device with the primary function of providing information to other devices is b) Server. Servers are powerful computers or devices dedicated to managing network resources and services, such as email, websites, and databases, offering these resources to client devices when requested. In contrast, a router is used to connect multiple devices on a network and manage traffic between them, a switch is used to connect devices within a single network segment, and a client is a device that accesses the services provided by a server.