This is the 14413th most frequent Korean word.
무엇입니까
"What is it?"
The word '무엇입니까' is used in this sentence to ask about the identification of '이것'(this).
이것은 무엇입니까?
What is this?
In this sentence, '무엇입니까' is used to seek clarification about '의제'(agenda).
참석자는 누구이며 의제는 무엇입니까?
Who is the attendee and what is the agenda?
The term '무엇입니까' here is employed to inquire the nature of '저곳에 조명'(light over there).