The Sundance Film Festival is an annual preview of some of the year's best movies. Not every Sundance film is bought and distributed, but the festival is the most prolific in the United States. It's given rise to all types of films over the years, from Oscar favorites (Boyhood) to stunning documentaries (Minding the Gap) to box office hits (Hereditary). What are the films to see from this year's fest? Read on to find out.