A bread knife is a serrated knife that is specifically designed for slicing bread. It is usually between 8 and 10 inches long, and has a wavy or serrated blade.
Bread knives are different from other serrated knives because they are designed to cut through the soft crumb of bread without crushing it. The wavy or serrated blade helps to grip the bread and make clean, even slices.
Bread knives are also often used to slice other types of food, such as tomatoes or pastries.