Definition
What is a timeline in video editing?
A timeline is the time-based editing workspace that represents a sequence from left to right. Editors place and trim video clips, audio, titles, effects, and transitions on tracks to build the order and timing of a finished video.
The timeline’s ruler displays timecode or frames, while a playhead identifies the current moment. Tracks allow picture, dialogue, music, and overlays to be stacked and synchronized. Editors can zoom in to make frame-accurate trims or zoom out to judge an entire act or program.
A timeline is usually non-destructive: editing the arrangement does not alter the camera original. It stores decisions about which part of a clip is used, where it begins, how it is transformed, and how it relates to other media in the sequence.
Example in the edit
An editor puts interview audio on tracks A1 and A2, lays its camera picture above it on V1, adds B-roll on V2, and puts names and captions on higher video tracks.
Why editors use it
The timeline makes time and layering visible. It is where editorial choices become a repeatable sequence that collaborators can review, revise, mix, and export.
Quick answers
Frequently asked questions about Timeline
Is a timeline the same as a sequence?
They are related but not identical. A sequence is the edited program or composition; a timeline is the workspace or representation used to arrange it.
What are tracks on a timeline?
Tracks are horizontal layers that hold video, audio, graphics, or other media. Stacking them lets an editor combine elements at the same time.
Does editing a timeline change the original file?
Usually no. Most editing applications save edit instructions and references to source media, leaving the original clips unchanged.