A Christmas tree is a decorated tree, usually an evergreen conifer, such as a spruce, pine or fir, or an artificial tree of similar appearance, associated with the celebration of Christmas.
Glade jul by Viggo Johansen (1891)
Typical North American family decorating Christmas tree (c. 1970s)
Martin Luther is depicted with his family and friends in front of a Christmas tree on Christmas Eve
Advent Sunday, also called the First Sunday of Advent or First Advent Sunday, among the Western Christian Churches, is the first day of the liturgical year and the start of the season of Advent.