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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 is a computer program that depends upon another program to function. Usually, client software receives data or instructions from a remote program called a server. Some thin clients actually have critical software components execute on the remote machine to conserve local resources or software licenses.