Rye sourdough is a type of bread made using rye flour and a natural leavening agent called sourdough starter. The starter is created by fermenting flour and water, which cultivates wild yeast and beneficial bacteria. This fermentation process gives rye sourdough its distinctive tangy flavor and chewy texture. Rye flour contains less gluten than wheat flour, making rye sourdough denser and darker. It is often praised for its health benefits, including higher fiber content and essential nutrients. Rye sourdough is popular in many cultures, particularly in Eastern European cuisines, where it is enjoyed with various toppings and spreads.