User experience (UX) refers to the overall experience that a user has when interacting with a product, service, or system. It encompasses all aspects of the user's interaction, including the visual design, ease of use, efficiency, and accessibility of the product.

UX design aims to create positive user experiences by understanding users' needs and behaviors, and designing products that meet those needs. This involves conducting user research, developing user personas, creating user journeys and wireframes, and conducting usability testing.

A good user experience is essential for the success of any product or service, as it can impact user satisfaction, loyalty, and ultimately, the bottom line.