'Konnichi Wa' is a Japanese expression meaning "hello" or "good day".
'Konnichi Wa' is a formal greeting in Japanese. It is used to greet someone when you meet them in the morning, and can also be used to say goodbye in the afternoon or evening. It is also used to greet someone who has just returned from a long trip. It is considered polite to use 'Konnichi Wa' when greeting someone, and it is often accompanied by a bow.