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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 client-server model is a distributed communication framework of network processes among service requestors, clients and service providers. The client-server connection is established through a network or the Internet. The client-server model is a core network computing concept also building functionality for email exchange and Web/database access. Clients include Web browsers, chat applications, and email software, among others.