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UI
Acronym for User Interface
It is the hardware or software device that allows you to interact with a machine. You use the UI to control the operations of a machine, while the machine presents information that can help you in your decision-making processes. The term UI also includes the windows and screens of the applications you use in everyday life, especially on the web.
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UX
Acronym for User Experience
In technology, we speak of UX to qualify the interactions of a user with a product, a system or a service. UX has two components: the first is related to perceptions of the technical characteristics of the tool (efficiency, security, reliability, etc.), while the second is related to its ergonomics (appearance, aesthetics, emotions, etc.). As a result, UX is subjective and can vary according to the different users.