what is the most famous christmas song

The most famous Christmas song is probably "Jingle Bells"! It's a classic that's been sung for generations and is known by people of all ages. The song was originally written as a Thanksgiving song in 1857 by James Pierpont, but it became associated with Christmas and has since become synonymous with the holiday. The song's catchy tune and festive lyrics make it a favorite among children and adults alike.