This is the 13005th most frequent Korean word.
동계올림픽
"동계올림픽" means "Winter Olympics."
Here, '동계올림픽' is used as a subject to refer to the Winter Olympics as a general concept.
동계올림픽은 겨울 스포츠의 축제입니다.
The Winter Olympics are a festival of winter sports.
In this context, '동계올림픽' specifies a particular past occurrence of the Winter Olympics.
저는 지난 동계올림픽에서 많은 경기를 보았습니다.
I watched many events during the last Winter Olympics.
Here, '동계올림픽' is used to refer to a specific, future instance of the Winter Olympics.