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Difference between UI and UX

There are two terms in design UI and UX can anyone explain? they confuse me a lot.

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migrated from graphicdesign.stackexchange.com Nov 3 '11 at 4:10

marked as duplicate by Jørn E. Angeltveit, Rahul♦ Nov 3 '11 at 10:24

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UI = User Interface

A user interface is the system by which people (users) interact with a machine. The user interface includes hardware (physical) and software (logical) components. User interfaces exist for various systems, and provide a means of:

Input, allowing the users to manipulate a system
Output, allowing the system to indicate the effects of the users' manipulation

Source: Wikipedia

enter image description here

UX = User Experience

is about how a person feels about using a product, system or service. User experience highlights the experiential, affective, meaningful and valuable aspects of human-computer interaction and product ownership, but it also includes a person’s perceptions of the practical aspects such as utility, ease of use and efficiency of the system. User experience is subjective in nature, because it is about an individual’s feelings and thoughts about the system. User experience is dynamic, because it changes over time as the circumstances change.

Source : Wikipedia

enter image description here

You can read these articles also for more knowledge..

Hope this will help...

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and GUI means Graphical User Interface en.wikipedia.org/wiki/Graphical_user_interface ( Just noticed that it was mentioned in the question tags. ) – Joonas Nov 2 '11 at 10:04
Good answer. I think it's also important to mention that they are very much related and have wide swaths of overlap. Things fall apart when UX is developed independent of UI or when one dictates the other (vs. them being developed holistically) – DA01 Nov 2 '11 at 14:42
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UI design should answer: "Is it easy for user to realize, accomplish task or use app functions?"

UX design - "Is the user enjoying UI?"

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