Learn in the textbookFundamentals of Processing Types and System Configuration
DefinitionA client-server system (クライアントサーバシステム) divides roles into the side that requests a service (the client) and the side that provides it (the server), and links them over a network.
ExplanationIt works through an exchange of requests and responses: the client asks for processing, and the server sends back the result. Placing data and programs on the server lets management and updates be handled together on the server side.
AnalogyIt is like a library patron asking for a book at the counter and a librarian fetching it from the stacks. Who asks and who responds is fixed.
Memory hookA client is someone who engages a service, and a server is one who serves. The meanings of the words are the two roles themselves.