What is the effect of the Extract button in the timeline?

The Extract button in the timeline is designed to lift frames from a sequence while ensuring that no gap is left in the timeline. This means that when clips are extracted, the remaining content shifts to fill the space left by the removed frames, resulting in a seamless edit without any empty space. This functionality is particularly useful for streamlining your editing process, as it allows for rapid adjustments to be made without manual repositioning of other clips.

The other options detail different actions that are not associated with the Extract button, such as permanently removing clips or duplicating frames, which do not achieve the same effect of maintaining timeline continuity. Understanding this feature is essential for efficient editing in Premiere, as it helps maintain the flow of the sequence while making necessary adjustments.