"Cailín Óg" is a traditional Irish folk song that tells the story of a young girl and her romantic longing. The title translates to "Young Girl" in English, and the song is often performed in both English and Irish. It captures themes of love, beauty, and nostalgia, making it a popular choice in Irish music circles. The song is frequently associated with the Irish folk music genre and has been covered by various artists, including The Dubliners and Clannad. Its simple melody and heartfelt lyrics resonate with listeners, contributing to its enduring popularity in Irish culture.