User Experience (UX) Design is an emerging and important discipline that applies concepts from Human-Centred Design to identify and solve usability problems.
User experience (UX) refers to any interaction a user has with a product or service. UX design considers each and every element that shapes this experience, how it makes the user feel, and how easy it is for the user to accomplish their desired tasks.
UX design could be anything from how a physical product feels in your hand, to how straightforward the checkout process is when buying something online, it could be how a website communicates with you to how you purchase a product online.
The goal of UX design is to create easy, efficient, relevant and all-round enjoyable experiences for the user. The UX design contributes to enjoyable and frictionless transactions between the business and the user (customer).
For a bad example of UX Design see this video: https://youtu.be/yY96hTb8WgI
Further reading: https://maze.co/collections/ux-ui-design/ux-examples/