Server is physical machine that consistently running throughout the day/week/years to serve end users, and not only to serve the end users also it serves client machine which laid on its network and it can controls it, depending on the services it provides to the end users or client computer it can be vary whether it’s a database server or file server or print server and etc.
Servers often provide necessary services across a network it may be a local user who is locally uses the service within the organization or remote users via internet, it’s an electronic process that shares its resource to one or more client processes is a named as server, how Its share a resources over the network, it’s through application which and installed on the server machine, for example let’s take a look at web server and how its provides a resources via LAN/WAN.