Documentaries aim to provide accurate information to educate viewers on various topics. They can cover any subject matter. Good documentaries, according to Oscar-winning director Alex Gibney, find important people involved in the story, achieve balance through editing, aim for objectivity, recognize the limitations of documentaries, and leverage what only cameras can do. There are several types of documentaries such as poetic, expository, observational, participatory, reflexive, and performative documentaries which differ in their approaches and styles of presentation.