This time of year it is important to remember what Advent means.
The word 'Advent' is from the Latin 'Adventus,' which means 'coming.' Advent is the beginning of a new liturgical year (in the Western churches), and encompasses the span of time from the fourth Sunday before Christmas, until the Nativity of Our Lord is celebrated. The first Sunday of Advent is the Sunday nearest the feast of St. Andrew the Apostle (which is November 30th), and so it will always fall somewhere between November 27th at the earliest and December 3rd at the latest. The liturgical color for this season is purple (Usually a deep purple as opposed to the lighter, red-violet shade of purple associated with Lent).
Like Lent, Advent is a preparatory season. It has significance because it is a season of looking forward and waiting for something greater; both for the annual celebration of the event of Christ's birth, and for the time when Christ will come again.