UX is an abbreviation for user experience. It refers to user experience design, it's a human-first approach to how users, clients, visitors, and guests interact with a company. Despite that it's very widespread to be used in tech, it's not bound to any medium, it can be implied to anything from websites and apps to vending machines, customer service, or even how a physical shop is designed. In other words, the purpose of UX design is to make easy, efficient, and pleasant experiences for the user.