It is the highest-grossing animated film of all time and one of Disney's top franchises. It was the most downloaded movie from Apple in 2014, and kids everywhere are still singing the movie's anthem, "Let It Go."
Heck, it's now probably stuck in your own head right now, even if you've never seen the film.
So why has the 2013 movie stuck around for so long for the under-5 set?
Experts say it is not just because you can find images of the movie's sisters on everything. Elsa and Anna are on dresses, on scooters and even on jelly beans.