What does it mean to 'nest' a sequence in Premiere Pro?

Nesting a sequence in Premiere Pro refers to the process of placing one sequence within another sequence. This functionality allows for greater organization and control of complex timelines by enabling the user to work with several clips or layers as a single unit. When a sequence is nested, any adjustments or effects applied to the nested sequence impact all of the clips within it collectively, streamlining the editing process.

For example, if you are working on a large project with multiple scenes that you have edited as separate sequences, you can nest these sequences into a master sequence to manage them more effectively and apply transitions or effects to the entire group rather than having to do so on each individual clip.

The other options do not accurately represent the concept of nesting. Saving multiple projects together is related to project management rather than nesting. Synchronizing audio and video clips is a process that involves aligning separate audio and video tracks, and duplicating a sequence pertains to creating a copy of an existing sequence rather than placing one within another.