Client-server systems is commonly known as the request-response model. The node or PC which sends requests for services is called the client.
Client-server systems are often implemented (and often identifiable with) the request-response model: a client makes a request to the server, which takes some action and returns a response to the client, typically with a result or acknowledgement.
The node or PC which sends requests for services is called client. While the System that provides the service and holds data in the network is called a server.
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