A good primer on user experience design here by Ali Rushdan Tariq:
Think about the last time you ate at a restaurant. What cuisine did it serve?
What made you to choose that particular restaurant? What was your first impression as you walked in? Were you asked to wait till you were ushered to an available seat? How was the menu arranged? Did food come quickly enough? How did it taste? How was the customer service? Did your squaring up go smoothly? Would you go back again?
Your answers to these questions, including all the emotional highs and lows, encompass the restaurant’s user experience (UX).
Today, UX has grown into an important design discipline that continues to grow and evolve. And while it’s fairly new, its multidisciplinary history can be traced all the way back to the Renaissance—if not earlier.