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The difference between a customer and a client can be rather confusing, and even controversial. The most commonly accepted and basic description of the difference is that a customer purchases goods or services from a business whereas a client receives services from a professional such as a lawyer or accountant.
The server is part of the clientâserver model; in this model, a server serves data for clients. The nature of communication between a client and server is request and response. This is in contrast with peer-to-peer model in which the relationship is on-demand reciprocation.