Serrated blade fabric scissors are a specialized style allows for a smoother sharper cut.
If you take a closer look at a serrated blade, you should see very distinct ridges located vertically along the blade. These ridges are the secret to achieving a smooth fabric cut that is smooth and causes no damage to the body of the fabric. In the cutting process, the ridges sharply graze against one another to ensure none of the fibers get caught in between the two blades.
Serrated fabric scissors are designed specifically for cutting sensitive fabrics like silks which can get damaged or caught by a conventional plain blade. Serrated blades are also perfect knits, especially light flimsy one like jersey. The ridge are are able to smoothly cut through without pulling any of the knit's threads or sensitive fibers.