What is how to say thank you in japanese?

Here's how to say thank you in Japanese:

The most common way to say "thank you" in Japanese is arigatou (ありがとう). This is a fairly casual expression suitable for most everyday situations. You can find more about Arigatou here.

To make it more polite, you can add "gozaimasu" (ございます) to the end, making it arigatou gozaimasu (ありがとうございます). This is a more formal and respectful way to express gratitude. Details can be found here for Arigatou%20Gozaimasu.

For very formal situations, or when you are deeply grateful, you can use domo arigatou gozaimasu (どうもありがとうございます). The "domo" (どうも) adds extra emphasis. More about Domo%20Arigatou%20Gozaimasu can be found here.

There are also other ways to express gratitude, such as sumimasen (すみません), which can mean "excuse me" or "I'm sorry," but can also be used to express gratitude, especially when someone has gone out of their way for you. Read more about Sumimasen here.