Documentaries claim to show reality but actually show a version of it from a certain point of view. There are three main modes of documentary: expository documentaries guide viewers through material using voiceovers, interviews and footage; interactive documentaries feature the filmmaker who actively engages with the material; and reflexive documentaries play with conventions and do not push a particular position, instead raising questions about objectivity and truth. Most documentaries contain elements of different modes and cannot be easily categorized.