A documentary is a nonfiction film: a film made from real people, real places and real events rather than from a script performed by actors. But that simple definition hides a complicated truth. Documentaries are not just recordings of life. They are shaped, edited, narrated and argued into stories — and two documentaries about the same subject can feel completely different. Here is what counts as a documentary, how the main styles work, how documentaries are actually made, and how they differ from news reports and docudramas.
What counts as a documentary
At its core, a documentary is a nonfiction film or series that aims to depict reality. It works with real people, real events and real-world contexts rather than invented characters and staged fiction. But a documentary is not a simple recording. Filmmakers choose what to film, whom to interview, what to leave out, how to order the material and what music to lay underneath it. Editing, narration, interviews and visual composition all build a specific perspective on the subject.
That is why scholars describe documentary not as a reproduction of reality but as a representation of the world we already occupy. The audience enters an unspoken agreement with the filmmaker: what is shown is presented as real, even though it has been selected and arranged. A documentary may have a point of view — many of the best ones do — but it is expected to be honest about its evidence.
Documentaries come in many forms, from a 90-minute cinema feature to a multi-part streaming series, from a natural history programme to a first-person essay film. Subjects range from historical events and scientific discoveries to subcultures, court cases, sport and families. What unites them is the claim to be dealing with the real world rather than an invented one.
The main styles
Film scholar Bill Nichols identified six modes of documentary, and they remain the most useful way to tell the styles apart. They describe tendencies rather than rigid boxes — most films blend more than one.
Expository. The classic, narrator-led documentary. A voiceover argues a case or explains a subject while the images provide the evidence. Nature and history series are the best-known examples — the BBC’s Planet Earth is expository in form — as are many historical documentaries built around narration, archive and expert interviews. This is the mode most people picture when they hear the word “documentary”.
Observational. The “fly on the wall” film. The camera watches life unfold with minimal intervention: no narration, few or no interviews, long takes and natural sound. The Maysles brothers’ Salesman (1969), which follows door-to-door Bible salesmen across America, is a landmark of the style, and Steve James’s Hoop Dreams (1994), which follows two Chicago schoolboys chasing basketball dreams over five years, is one of its most celebrated achievements. Observational films aim to show events as they happen, though the mere presence of a camera always changes behaviour to some degree.
Participatory. The filmmaker steps into the frame — questioning, provoking, or appearing on camera alongside the subjects. Claude Lanzmann’s Shoah (1985), built almost entirely from interviews with survivors, bystanders and perpetrators of the Holocaust, is a defining example. Participatory documentaries accept that filming changes events, and make that interaction part of the film.
Reflexive. The film draws attention to its own making — showing the crew, the editing choices, or the artificiality of the documentary form itself. Dziga Vertov’s Man with a Movie Camera (1929), which shows its own cameraman at work and experiments with editing in full view of the audience, is the founding example.
Poetic. Image, rhythm and mood take priority over argument or information. Godfrey Reggio’s Koyaanisqatsi (1982), a film without dialogue or narration that sets time-lapse images of cities and landscapes to music, is the classic case. Poetic documentaries are closer to visual art than to journalism, but they still work with real footage of the real world.
Performative. Personal, subjective and often first-person, these films stress the filmmaker’s own experience and emotional response rather than claiming objectivity. They are strongly personal and sometimes experimental, and they blur the line between documentary and essay.
Beyond Nichols’s six modes, two practical categories dominate streaming today. Historical documentaries reconstruct past events using archival footage, photographs, expert interviews and sometimes dramatic re-enactment — Ken Burns’s The Civil War is the model many later series followed. And docuseries, multi-episode documentaries that borrow the pacing and cliffhangers of drama, have become the default form for true crime and celebrity stories on streaming platforms.
How documentaries are made
A documentary follows the same broad stages as any film — development, production and post-production — but the material already exists in the world and has to be found, verified and earned.
Research comes first. Strong documentary work begins with questions and reading, not with a camera. Filmmakers review public records, books, news reports, photographs, archives and earlier interviews before approaching participants. Research identifies what is known, what is disputed, and what evidence could clarify the story. It also shapes the central question the film will try to answer — and a good documentary is usually built around a question, not a conclusion decided in advance.
Access is the hardest part. A documentary needs people who will speak on camera, locations that can be filmed, and archives that can be licensed. Gaining trust can take months or years: subjects are often being asked to share painful, private or risky parts of their lives. Filmmakers must explain the project honestly, obtain informed consent, and keep checking that consent as the film develops — particularly when people are vulnerable, discussing trauma, or filmed in situations where power is unequal.
Filming is observation, interview and collection. The four raw materials of most documentaries are observation (watching life unfold, often handheld and unlit), interviews (a person speaking about what happened, usually in a “talking head” framing), archive (newsreels, home movies, photographs, documents) and narration. A crew will typically shoot far more material than the film can use — hundreds of hours for a feature — and the real shaping happens in the edit, where a story is assembled from fragments. Editors decide the order of events, which interviews to trust, what to leave out, and how much context the audience needs.
Archive needs verification too. Old footage is powerful evidence, but it is also easy to misuse. Teams must establish where material came from, confirm dates and captions, check that the footage shows what it claims to show, and respect licensing terms. A photograph or clip used out of context can mislead as surely as a false statement.
Fact-checking: the part audiences never see
Because documentaries present themselves as true, accuracy is their foundation. Responsible teams verify claims before they reach the screen. The working standard used by many filmmakers and journalists is to check important claims against at least three credible, independent sources — not three websites repeating the same report, but genuinely separate evidence. A dramatic interview may be sincere and still be incomplete or mistaken, so teams compare accounts, seek primary records where they exist, and give people a fair opportunity to respond to serious allegations.
Fact-checking also covers the details: dates, names, spellings, quotations, statistics and the context of archive material. Some productions hire independent researchers or fact-checkers, and some dedicate a significant share of their post-production budget to verification. If a claim cannot be verified, the honest choices are to leave it out, or to say on screen that it is unverified or disputed.
Ethics run alongside accuracy. The International Documentary Association and groups such as the Documentary Accountability Working Group have developed guidance for filmmakers, and the issues are consistent: informed consent, truth and accuracy, fair representation, privacy, minimising harm, managing bias, and the power imbalance between filmmaker and subject. Consent alone does not settle every question — filmmakers must also ask whether a scene could expose someone to harm, whether identifying details are necessary, and whether the finished film represents its participants fairly.
How documentaries differ from news reports and docudramas
The differences are about purpose, form and time. A news report is made quickly, answers the basic questions of who, what, when, where and why, and aims for balance within a short window. A documentary has months or years, a point of view, and room to explore character and context — but it is held to the same basic duty not to mislead.
A docudrama — or “based on a true story” drama — is different in kind. It uses actors, invented dialogue and staged scenes to retell real events, and its priority is dramatic shape rather than evidence. A documentary can use re-enactment, but honest films signal it clearly, so the audience knows what is reconstructed and what is recorded. When a drama is presented as documentary, or a documentary quietly stages what it claims to have observed, audiences are misled about what they are watching.
How to watch a documentary critically
Documentaries ask for trust, and a good viewer returns the favour with attention. Ask who made the film and why, what sources it cites, whether competing evidence is acknowledged, and whether its conclusions follow from the material shown. Notice what the film does not show, and whether the people criticised in it were given a chance to respond. Check whether archive footage is dated and captioned, and whether re-enactments are labelled. None of this means being cynical — most documentaries are made in good faith — but the form’s power comes from its claim to reality, and that claim is worth testing.
Why documentaries matter
Documentaries do work that no other form can do quite as well. They preserve events and voices that would otherwise be lost, they can change how a subject is understood, and they give audiences time with people and places they would never otherwise meet. The best of them — from Nanook of the North (1922), Robert Flaherty’s pioneering portrait of an Inuit hunter, to the observational masterpieces and essay films of today — show that a camera pointed at the real world, honestly and carefully, can be as absorbing as any fiction.