So, a nickname is like a special name that people sometimes give to their friends or family members. It is different from their real name and can be a shorter version or a name that describes something about them.
Now, a chao is a special kind of nickname that people use in some cultures. It is often used by parents or grandparents when they are talking to their children or grandchildren. It is a way for them to express love and affection.
For example, let's say your real name is Emily. Your mom or dad may call you "Chao Emily" as a special nickname. It is like a cute and loving way to say your name.
Think of it like when you have a special toy that you love and you give it a special name, like "Fluffy". Chao is kind of like that, a special name that makes someone feel loved and appreciated.