These are the movies released during the holiday season. They usually are released from about the second week of November to the third week of December, sometimes even on Christmas Day. These movies are usually family-friendly (and often holiday-themed) movies but may also be movies that are Oscar-worthy. This and the summer blockbuster season are the two most important in Hollywood.
Family-friendly movies such as those in the "Harry Potter" and "Chronicles of Narnia" movies are released during the holiday movie season. Oscar winners like "Titanic" are also released at this time.