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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.
A computer system or process that requests a service of another computer system or process (a server) using some kind of protocol and accepts the server's responses. A client is part of a client-server software architecture.