ありがとう ... It is what you say to thank someone.
It os often translated as "Thank you!" but in this word, there is nothing that says "THANK" or "You". It is just a word. I think this I the most beautiful word in Japanese.

One year ago today, I had to put Doan my dog, Pompom. After one year, I miss him but most of all I just want to day Arigatō for 15 years. I hoe I will meet him again.