A friend in the Uk sent it to me and every day from December 1st to December 24th I open a window of the little house. Inside the windows are pictures of toys and Christmas decorations.
An Advent calendar is a European tradition. It started over 100 years ago. Advent is the Christian church special time before Christmas - every year is different - starting between November 27th and December 3rd.
At this time church members have special prayers and songs as they prepare to celebrate the birth of Jesus Christ - a countdown to the main festival of Christmas.
Now, even people who do not go to church often display an advent calendar as a way of counting down to Christmas - specially for kids.
Sometimes the calendars have pictures inside the windows, and sometimes they have small chocolates inside. The calender itself can be a house picture, or a tree - or a winter scene.