a chef holds up a large bread knife, showing its distinctive zigzag edge to a young cooking student. The knife's blade displays sharp, triangular teeth pointing in alternating directions like a saw. The student points at the jagged edge while the chef demonstrates how it differs from a smooth knife nearby. The serrated blade catches the kitchen light, highlighting each individual tooth along the cutting edge. Other kitchen tools with smooth edges sit on the counter for comparison. the jagged, saw-toothed edge that makes something serrated