What action does the "," shortcut perform in Premiere?

The "," shortcut in Premiere Pro performs the action of inserting media from the source monitor into the timeline while maintaining the overall timing of the existing clips, effectively applying a ripple edit. This means that when you insert the clip, the surrounding clips shift to accommodate the new content without overwriting anything. The ripple edit allows for a seamless integration of new media, ensuring that the overall flow of the timeline remains intact, which is essential for maintaining sync and pacing in your project.

This functionality is particularly useful when you want to expand the content of your timeline without disrupting the existing edits, as it allows you to enhance your project with new material while keeping all other edits and transitions in place.