What does leavened bread means?

Leavened bread refers to bread that has been raised using a leavening agent, such as yeast or baking powder, which causes the dough to rise and become light and fluffy. Leavening agents produce gas bubbles that become trapped in the dough, resulting in a porous texture. This process is in contrast to unleavened bread, which is made without any leavening agents and therefore remains flat and dense. Leavening bread has been a common practice in various cultures throughout history and is used to produce a wide variety of breads, including loaves, rolls, and buns, each with its distinct texture and flavor.