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At the most basic level, the user interface (UI) is the series of screens, pages, and visual elements—like buttons and icons—that enable a person to interact with a product or service.

User experience (UX), on the other hand, is the internal experience that a person has as they interact with every aspect of a company’s products and services.

It’s common for folks to use these terms interchangeably, or sometimes incorrectly. If you’ve ever wondered, “What is UI, what is UX, and what’s the difference between them?” in today’s post we’ll dig a bit deeper into UI and UX to get a better understanding of the differences between them.

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What is UI?

Simply put, user interface (UI) is anything a user may interact with to use a digital product or service. This includes everything from screens and touchscreens, keyboards, sounds, and even lights. To understand the evolution of UI, however, it’s helpful to learn a bit more about its history and how it has evolved into best practices and a profession.

A brief history of the user interface

Back in the 1970’s, if you wanted to use a computer, you had to use the command line interface. The graphical interfaces used today didn’t yet exist commercially. For a computer to work, users needed to communicate via programming language, requiring seemingly infinite lines of code to complete a simple task.

By the 1980’s the first graphical user interface (GUI) was developed by computer scientists at Xerox PARC. With this groundbreaking innovation, users could now interact with their personal computers by visually submitting commands through icons, buttons, menus, and checkboxes.