User experience (UX) encompasses all aspects of a user's interaction with a company, its services, and products. UX involves a person's behaviors, attitudes, and emotions when using a product or service. It also includes their perceptions of aspects like usability, ease of use, and efficiency. UX is dynamic as it changes over time with usage circumstances and system changes. To design for positive UX, companies use user-centered design approaches like personas, user stories, prototypes, and usability testing to understand users and optimize the product around their needs and goals. Various tools and methods are used to measure and improve UX.