Documentaries aim to document reality by informing, educating, and entertaining audiences on specific subjects or issues. They use various techniques like observations, interviews, dramatizations, and narration. Direct Cinema and Cinema Verite movements aimed to present social and political issues with minimal filmmaker involvement. There are different documentary styles including fully narrated, fly on the wall, mixed, self-reflexive, docu-drama, and docu-soap that combine elements like narration, interviews, and observations in different ways to convey meaning and advance arguments.