interjection
Casual interjection borrowed from English, used to respond to thanks, apologies, or requests in a light, friendly way.
「手伝ってくれてありがとう!」「ノープロブレム!」
"Thanks for helping!" "No problem!"
「遅れてごめん。」「ノープロブレム、気にしないで。」
"Sorry I'm late." "No problem, don't worry about it."
Direct borrowing from English 'no problem', used as a casual interjection in Japanese.