A good Christmas movie is one that captures the essence of the holiday season, whether through its story, characters, or overall atmosphere. It should have a sense of warmth and nostalgia, with themes of family, friendship, and selflessness. Some popular options include "It's a Wonderful Life," "A Christmas Story," "Elf," "Home Alone," "The Polar Express," and "The Grinch." It all depends on your personal preference, but the key is to find one that makes you feel the spirit of Christmas.