UI refers to User Interface. It is also known as User experience design (UED). It is the design of user interfaces used for mainly machines and software. It is used in electrical appliances like computers, mobile phones, etc and home appliances like washing machine, grinder, etc. It is used to attract more users by developing the designs. It is important for users to quick access. Also, for a developed mobile applications, UI UX are so much important.
Most people assume that UI/UX designers spend their time designing the user interface. While the user interface is certainly a part of UX design, it doesn't encompass everything. In our world, designers are in charge of three things: User experience, visual design and aesthetics, and website or app functionality.
User experience is about how your app or website works with users from a functional perspective. It's about how fast they can access content on your site and navigate around without getting trapped on any dead ends or loaded pages.
For all the different theories and concepts that exist on this topic, there's one thing that all experts agree on: good UI/UX is fundamentally important. Put simply, a product's interface has to be intuitive, well-organized, and easy to use for it to truly succeed.
The question then becomes: how do you know where to start when attempting a new UI/UX? The first step is often creating wireframes or prototypes of what your product will look like in order to test how it will work in practice before investing in expensive design elements. But even then, there are plenty of other considerations such as color theory and typography which can make or break your project from the get-go.