Arigatou gozaimasu is a polite way to say "Thank you" or "Thank you very much" in Japanese. You use it to express gratitude to someone who has done something for you or given you something. For instance, if someone helps you, you'd politely say, "手伝ってくれて、ありがとうございます！" (Thank you for helping me!).

感謝の気持ちを伝える、丁寧な言葉です。何かをしてもらった時やプレゼントをもらった時に使います。