This is the 12453rd most frequent Korean word.
당선자에게
"To the elected person."
Here, "당선자에게" represents the recipient of an action, specifically sending congratulations directed towards the person who won.
당선자에게 축하의 말을 전했습니다.
I conveyed my congratulations to the winner.
In this sentence, "당선자에게" functions to show the indirect object where gifts are directed.
모든 참가자가 당선자에게 선물을 보냈습니다.
All participants sent gifts to the winner.
The term "당선자에게" here indicates who was the recipient of the questions in the context of the speech.