What is Advent?

I am a little late on posting videos about Advent, but here is a good one that I found on the Aggie Catholics blog:



I had no idea what "Gangnam Style" meant until I looked it up, but the video makes sense even if you don't know what it means. I was not previously familiar with the organization that made the video, xt3.com. Evidently it is an "award-winning Catholic online network" which is run by the Archdiocese of Sydney, Australia.