How do say hello in japaneese?

The most common way to say "hello" in Japanese is こんにちは (konnichiwa).

Here are some other ways to say hello, depending on the context:

* おはようございます (ohayou gozaimasu): Good morning (formal)

* おはよう (ohayou): Good morning (informal)

* こんばんは (konbanwa): Good evening (formal/informal)

* もしもし (moshi moshi): Hello (on the phone)

* ただいま (tadaima): I'm home (used when arriving home)

* いらっしゃいませ (irasshaimase): Welcome (used in stores)

Note: The level of formality in Japanese is very important. "Konnichiwa" is a polite way to greet someone, while "ohayou" is more informal.