Rye bread is a type of bread made from rye flour, which is derived from the rye grain. It is known for its dense texture and slightly sour flavor, often attributed to the fermentation process used in its preparation. Rye bread can vary in color from light to dark, depending on the type of flour used, and is commonly found in various forms, including pumpernickel and rye sourdough. This bread is popular in many cultures, particularly in Eastern Europe and Scandinavia, where it is often served with hearty meals. Rye bread is considered to be more nutritious than white bread, as it contains more fiber and essential nutrients. It is also known for its ability to keep longer without spoiling.