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Customer is the person or something like a company having a physical existence and identity where as customer service is a service given to customer which cannot be seen and measured but can be accounted for
Interesting topic... Customer Service is all about servicing customers across life cycle starting from exploring a product / service, buy, enhance usage till retention... with an objective to provide effortless experience. And all those individuals / businesses who have shown interest / taken the product / service are known as customers, they may be internal or external too.