no, not at all; you're welcomeUsed to politely deny thanks, praise, or an apology. It can also mean “no, no” when correcting or modestly rejecting something.
JA: 「手伝ってくれてありがとう。」「いえいえ、どういたしまして。」
EN: “Thank you for helping me.” “No, not at all. You're welcome.”