The advent calendar is used for us to count down the days until Christmas. There are different types and customs but the classic one simply has 24 days and it is a popular tradition especially liked by all children. There is usually some surprise hidden in each day in the form of various sweets.
Coloring Book Advent Calendar
These kinds of calendars usually consist of 24 windows or doors as we wrote above - when you open them you see symbols of Jesus related to the birth. In the past there were also smaller or larger fragments of texts from the Holy Scriptures. Later there was a commercialization of such windows where Christmas decorations, various toys or candies for children appeared. That is why this custom is very popular among children because nowadays we can buy such Christmas calendars in stores where we have hidden candies or toys. Day after day we open only one window and so on for 24 days.