YOU SAID:
What is this app and how do I use it?!
INTO JAPANESE
このアプリとは何ですか?どのように使用しますか?!
BACK INTO ENGLISH
What is this app? How do you use it? !!
INTO JAPANESE
このアプリは何ですか?どんなふうに使うの? !!
BACK INTO ENGLISH
What is this app? How do you use it? !!
You've done this before, haven't you.