We have special songs that we sing during the Christmas season. The songs are known as carols and they are about when Jesus was born. They were written for a special purpose, often to accompany performances of religious dramas dating from medieval times.
People go 'carol singing'. This is where people will go from house to house singing carols and collecting money for charity.
The traditional period to sing carols was from St Thomas's Day (December 21) until the morning of Christmas Day.