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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.
Definition of client for English Language Learners. : 1  a person who pays a professional person or organization for services. : 2  a customer in a shop or hotel. 3  computers : a computer in a network that uses the services provided by a server.