Editing is the process of selecting and preparing language, images, sound, video, or film through processes of correction, condensation, organization, and other modifications in various media. A person who edits is called an editor. In a sense, the editing process originates with the idea for the work itself and continues in the relationship between the author and the editor. Editing is, therefore, also a practice that includes creative skills, human relations, and a precise set of methods
Films are made up of a series of individual images called frames. When these images are shown rapidly in succession, a viewer has the illusion that motion is occurring. The viewer cannot see the flickering between frames due to an effect known as persistence of vision, whereby the eye retains a visual image for a fraction of a second after the source has been removed. Viewers perceive motion due to a psychological effect called beta movement.