Documentary films began in 1926 when John Grierson coined the term. While documentaries originally referred to films shot on film stock, the definition has expanded to include digital and video productions. Documentaries present factual information about real events or topics through footage, reconstruction, narration, and interviews. They have five main features: observation, interviews, dramatization, mise-en-scene, and exposition. Common documentary types include fully narrated, docudrama, self-reflective, fly on the wall, docusoap, and mixed documentaries. The typical documentary structure includes an introduction posing a central question, a middle examining the issue through opinions and facts, and an ending providing a resolution and clear message.