Is Deck the Halls a true Christmas carol?

"Deck the Halls" may not be considered a traditional Christmas carol in the conventional sense, but rather a well-known festive song associated with the holiday season. This song originates from a traditional Welsh melody called "Nos Galan" or "New Year's Eve," which was later coupled with the poem written by Thomas Oliphant in 1867, titled "Deck the Hall with Boughs of Holly." Despite its relatively recent origins compared to other Christmas carols, "Deck the Halls" has gained popularity and become widely sung during the Christmas and holiday period, especially in English-speaking countries.