The primary function of a server in client-server architecture is to manage resources and provide services to clients. Servers process requests from client devices, delivering data, applications, or services as needed. They host websites, store files, and manage databases, ensuring efficient resource distribution among users. Servers can operate in various configurations, including web servers, application servers, and database servers. This architecture allows for centralized management of resources, enhancing performance, security, and scalability in distributed computing environments.