Film editing involves structuring the story and removing boring parts to create rhythm. There are several forms of on-screen editing including continuity, montage, cross-cutting, on/off-screen shots, and cover shots. Continuity creates a seamless story between shots while montage uses a series of shots to achieve an emotional impact. Cross-cutting cuts between two scenes to show things happening simultaneously. On/off-screen shots compress time and isolate locations. Cover shots establish shots within and outside the frame. Sound, including dialogue, music, and effects, is also important for delivering continuity and influencing mood. Juxtaposition of shots can exaggerate or understate emotions.