How would you explain what a varicella zoster (shingles) is in layman's terms?

Recurrent chickenpo: When first infected with chickenpox (varicella) the virus remains alive in your nervous system for the rest of your life and for unclear reasons can recur, often in localized area of your body (on one side only). This latter rash is called zoster and a person who has never had chickenpox can "get" chickenpox from this rash, .