Rudolf is a fictional reindeer known for his bright red nose, which lights up the night sky. He is often depicted as the leader of Santa Claus's team of reindeer, guiding the sleigh on Christmas Eve. The character first appeared in a 1939 booklet written by Robert L. May and later became popular through the song "Rudolph the Red-Nosed Reindeer." Rudolf's story emphasizes themes of acceptance and overcoming adversity. Initially shunned by the other reindeer due to his unusual nose, he ultimately proves his worth by helping Santa Claus navigate through foggy weather, showcasing the importance of embracing differences.