WHAT ARE SERVERS?
A server is a computer designed to process requests and deliver data to another computer over the internet or a local network.
Most computer networks support one or more servers that handle specialized tasks. As a rule, the larger the network in terms of clients that connect to it or the amount of data that it moves, the more likely it is that several servers play a role, each dedicated to a specific purpose.
Strictly speaking, the server is the software that handles a specific task. However, the powerful hardware that supports this software is also usually called a server because server software coordinating a network of hundreds or thousands of clients requires hardware much more robust than what you’d buy for ordinary consumer use.