Information Architecture - Content Strategy - Interaction Design - Visual Design (UI) - And much more … UX is the resulting opinion/emotion felt by the user (e.g., it’s fast/slow, intuitive/confusing, and/or makes the user feel happy/frustrated).
understand by any users - Even your grandma can use it. - modern elegant UI - Offers many useful features - looks complicated for your grandma. She might call you to assist her how to use the app. :D