For example, in English, we use formal and informal greetings.
In China, a traditional greeting is "Have you eaten to day?"In addition, there are rules for making small talk when you meet a person.
Once you have learned the rules of language, you can communicate more easily and avoid misunderstandings.
Prople in different cultures also have different ways of using their bodies to communcate.
We use our heads and our hands to make gestures, for example.
But there's one kind of communication that's the same everywhere.
A smile can always connect people.