UX stands for User Experience. It involves analyzing and understanding the user interaction with the features of an app. The aim of UX app design is to turn users into loyal customers by providing a splendid visual journey.
On the other hand, UI is the acronym for User Interface. It is all about the actual presentation of the app while determining how every element in the app will align on the page in relation to one another. This particularly includes things like- icons, colours, buttons, fonts, images, etc. The primary goal of UI design is to provide the best interaction possible.