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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.
Customer service refers to the way that companies behave towards their customers, for example how well they treat them. (BUSINESS) n-uncount. ...a mail-order business with a strong reputation for customer service..., The firm has an excellent customer service department. Translation English Cobuild Collins Dictionary.