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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 client purchases a service (this may involve goods as well), and the interaction generally continues for more than one meeting. A client is purchasing your time, and your expertise...but not necessarily an object that you can hold in your hand. This is why lawyers have clients, but a shop owner would have a customer.