ありがとう

ありがとう
interjection
thank you
1. thank you, thanks
An expression of gratitude. Casual form of ありがとうございます.
Thanks for helping me.
ありがとうございます
Thank you very much.
Polite form
どうもありがとう。
Thank you very much.
Common emphasis
Thanks for coming. I'm happy to see you.
Casual tone with friends
Thanks so much for yesterday. I don't think I could have done anything without you.
Expressing deep gratitude

ありがとう is casual and used with friends, family, and people of lower status. ありがとうございます is the polite form for strangers, superiors, and formal situations. どうも can be added for emphasis. The word originally comes from ()(がた), meaning 'rare/difficult to have' - expressing that something is precious.