Documentaries aim to document and educate about real life. They began in 1895 with short, unedited films by the Lumiere Brothers. In the 1920s, Nanook of the North used creative interpretations to make factual films more dramatic. Later documentaries emphasized poetic elements and direct cinema aimed to present events unmediated. Key documentary techniques include observation footage, interviews, dramatization, mise-en-scene, exposition, and different types like fully narrated, fly on the wall, and mixed formats.