How did sourdough bread get its name?

Sourdough bread gets its name from the natural fermentation process that involves wild yeast and lactic acid bacteria, which create a sour flavor. The term "sourdough" refers to the tangy taste resulting from the fermentation, distinguishing it from breads made with commercial yeast. This method of leavening has ancient origins, likely dating back to at least 1500 B.C., when it was discovered that dough left to ferment would rise and develop a unique flavor.