During the holidays, we cherish loved ones a little extra, spread the gift of giving, and watch our favorite Christmas movies.Their popularity has risen in recent years, and though new ones pop up every winter, the classics still tug at our heartstrings. But, what keeps them at the top of our lists every year?"What defines a Christmas movie? Well, I would say they tend to be movies released in the autumn, generally between October and December,” UM-Milwaukee Media Cinema Professor Elana Devine said. "In recent years, they've become a big phenomenon on television, in particular, you know, made-for-television versions."