The UK Albums Chart is a weekly record chart based on sales of albums in the United Kingdom; the term "Christmas number ones" refers to the records that are at the top of the chart on Christmas Day. Typically, the Christmas number one is the album that was announced as number one on the Sunday before 25 December. When Christmas Day falls on a Sunday itself, the official number one is the one announced on that day's chart. As of December 2018, 60 albums have been Christmas number ones.