A plain-language explanation
UX, i.e. User Experience, is the entire user experience resulting from contact with a product, service, website or application.
Where it helps in practice
User experience covers the complete journey, expectations and consequences, not just convenience on one screen.
The decision before implementation
Begin with task and context, gather evidence, remove barriers and separate content, process and interface problems.
How to verify the result
Combine observation, completion, time, errors, satisfaction and business outcome rather than internal opinion.
