A judged contest or competition, especially common for music, art, speech, photography, and similar skills or works. It is less often used for ordinary sports matches, where words like 試合 or 大会 may be more natural.
from French concours
My daughter won a prize in a piano competition.
この写真コンクールには全国から作品が集まる。
Entries for this photo contest come in from all over the country.
She ended up entering a piano competition.
He won first prize in a photography competition.
That work won an award in the competition.
The city holds a calligraphy competition every year.