Learn in the textbookTypes and Characteristics of Computers
DefinitionA server (サーバ) is a computer whose role is to take requests from other computers (clients, クライアント) over a network and supply them with data or functions.
ExplanationServers are named after what they provide: one that returns web pages is a web server, and one that passes mail along is a mail server. Because they handle many requests without a break, many are built with more processing power and reliability than a PC.
AnalogyIt is like a library's front desk, which brings out the book each visitor asks for.
Memory hookTo serve is to bring people what they ask for, so the machine that does it is a server.