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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.
These are the applications which consist of the the client-side (frontend) and the server-side (backend). The client-side is ultimately what the user sees on the screen, whether it is the screen of a mobile device or a computer monitor. The client-side is responsible for guiding the user through the workflows established by the application which ultimately is the user experience.