What is the primary function of the source monitor in Premiere Pro?

The primary function of the source monitor in Adobe Premiere Pro is to preview and trim clips before adding them to the timeline. This tool allows editors to load video and audio clips from their projects or media bins, enabling them to view footage in detail. By using the source monitor, editors can play clips, set in and out points, and perform essential trimming operations, ensuring that only the desired portions of clips are brought into the timeline for further editing.

In contrast to mixing audio tracks, exporting sequences, or adjusting video effects, the source monitor specifically focuses on the manipulation and preparation of individual clips prior to their integration into a larger project. This makes it an essential component of the editing workflow, supporting the organization and refinement of media before it is placed on the timeline for more complex editing tasks.