UI design focuses on the visual elements and layout of a product, ensuring it is attractive and thematically appropriate, while UX design centers on the overall user experience, emphasizing ease of interaction with the UI. The key differences include that UX is more analytical and research-based, aiming to improve user flow, whereas UI is more artistic and concerned with aesthetics. Both UI and UX contribute to the same goals, but they require different skills and thought processes.

1. UI vs UX – What’s the difference?
What is UI design (User Interface)?
User interface design is focused on the look and layout — how each element
of the product (mobile app or website) will look, including color
combinations, buttons, placeholders, text, images, animations and any
visual interface elements users interact with.
This job falls to UI designers. They decide how the application is going to
look like. They have to choose color schemes and button shapes — the
width of lines and the fonts used for text. It’s up to them to make sure the
product’s interface is attractive, visually-stimulating and themed
appropriately to match the purpose and/or personality of the app.
What is UX design (User Experience)?
User experience is the overall experience a user has with a product. User
experience is determined by how easy or difficult it is to interact with the
user interface elements that the UI designers have designed.
This job falls to UX designers. They are in charge of determining how the
user interface operates. Is the user flow smooth, seamless, and intuitive, or
is it confusing and unwieldy? Does the button color and position encourage
people to click, or make them hesitate?
UX design mainly involves research to understand things like customer
pain points, potential market gaps, and competitor analysis.
Key difference between UI and UX
 UX is a science and UI is an art
 UX are wireframes of product and UI represents real look and feel of
product.
 UX searches for solutions and UI determines the look.

2.  UX focuses on the user journey while UI focuses on product
snapshots.
 UX helps people achieve predefined goals, UI makes users connect to
the product.
Though serving the same business goals, UX and UI require different
thinking processes and strengths. UX design is based on an audience’s
wants and needs, while UI design is based on the research,
recommendations, and requirements of the UX
designer. https://www.think-straight.com/