Matza (also Matzah, Matzoh, or Matsah, Hebrew: ???????, in Ashkenazi matzo or matzoh, and, in Yiddish, matze) is a cracker-like flatbread made of white plain flour and water. The dough is pricked in several places and not allowed to rise before or during baking, thereby producing a hard, flat bread. It is similar in preparation to the Southwest Asian lavash and the Indian chapati. Matza is the substitute for bread during the Jewish holiday of Passover, when eating chametzâ€”bread and leavened productsâ€”is forbidden. Eating matza on the night of the seder is considered a positive mitzvah, i.e., a commandment. In the context of the Passover seder meal, certain restrictions additional to the chametz prohibitions are to be met for the matza to be considered "mitzva matza", that is, matza that meets the requirements of the positive commandment to eat matza at the seder. In The Netherlands it is traditional for Christian families to eat matzo at Easter. Flour is a powder made of cereal grains. It is the main ingredient of bread, which is a staple food for many civilizations, making the availability of adequate supplies of flour a major economic and political issue at various times throughout history. Wheat flour is one of the most important foods in European and North American culture, and is the defining ingredient in most European styles of breads and pastries. Maize flour has been important in Mesoamerican cuisine since ancient times, and remains a staple in much of Latin American cuisine. Flour contains a high proportion of starches, which are complex carbohydrates also known as polysaccharides. Leavening agents are used with some flours, especially those with significant gluten content, to produce lighter and softer baked products by embedding small gas bubbles. The production of flour has also historically driven technological development, as attempts to make gristmills more productive and less labor-intensive led to the watermill and windmill, terms now applied more broadly to uses of water and wind power for purposes other than milling.