Most popular editing platforms include a variation of this tool:
Professional editors use it to refine hair or mask edges, making cutouts look more natural by "pushing" the subject's pixels slightly into the background. Photo Editor Smudge
The tool picks up color from where you start your stroke and pushes it in the direction you drag. Modern software like Adobe Photoshop allows you to adjust the "strength" of the smudge—lower strength creates a subtle blend, while higher strength creates long, dramatic streaks. Common Creative Uses Most popular editing platforms include a variation of