This is the 12922nd most frequent Korean word.
독도
Dokdo: A group of small islets in the East Sea (Sea of Japan), claimed by both South Korea and Japan, administered by South Korea.
In this sentence, "독도" is used as a proper noun, referring specifically to the geographical location of the island Dokdo.
독도는 한국의 섬입니다.
Dokdo is an island of Korea.
Here, "독도" functions as the direct object of the verb '방문해 보다' (to visit), indicating the location being visited.
독도를 방문해 본 적이 있나요?
Have you ever visited Dokdo?
In this usage, "독도" represents the subject of the clause, emphasizing its connection to national identity and territorial discussions.