First of all, you should know that UX and UI go together but each one has its meaning, they complement each other but they also work independently.
Before we go deeper, here is a basic concept:
- UX or User Experience is the internal experience that a user has when interacting with the products and services of a company.
- UI or User Interface is a series of displays, pages and visual elements (such as buttons and icons) that are used to interact with a device.
Introducing their history:
A Little History of UI
To understand what UI consists of it is necessary to go back to the first computers. It was created in the 70s using command lines as an interface (screens full of letters and numbers), so to understand it, it was necessary to know the programming language. The computers did not have graphics, buttons, or even a mouse, until 1984 when Apple successfully commercialized a computer that had an interface with several windows and a mouse.