UX, or User Experience Design is the lesser known half of UI, or User Interface. While UI designers are primarily concerned with the layout of a particular product, UX designers are focused on enhancing a user’s satisfaction by improving the usability and accessibility to provide the most pleasurable experience possible. The User experience designer can thank Donald Normal, a UX architect, who coined the term back in 80’s- a time when HCI (Human-Computer Interaction) was on the rise and computers became a commonly owned commodity. “I invented the term because I thought human interface and usability were too narrow. I wanted to cover all aspects of the person's experience with the system including industrial design graphics, the interface, the physical interaction and the manual. Since then the term has spread widely, so much so that it is starting to lose its meaning.” — Donald Norman
Any high production app or website you come across has a team graphic, visual, interaction and voice designers behind it. These designers create an untested version to give to the UX designer, in order to improve it's accessibility and usability through various tests. This detailed process is what allows you to browse website and apps with ease - and what keeps you using them.