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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.
Normally, a user interacts (interfaces) only with a client whereas the server might be out of sight. A user logged on to a website is using a client computer (with the browser as the client software) that is connected via internet to a server (website's computer).