What Is Matzo Meal?
Matzo meal is a kind of breadcrumb made from ground matzo. Matzos meal can be coarse or fine, depending on the application. It is an essential ingredient in Jewish cooking — especially matzos ball soup — and can also be used in kugels, casseroles, and baking applications, specifically around Passover, when the use of other ingredients by Jews, such as wheat flour and cornmeal, is restricted. 

What Is Matzo? 
Matzo (also matza or matzah) is an unleavened flatbread typical in Jewish cooking, especially around the spring feast Passover, when eating certain foods is restricted. During Passover, only matzo made with flour and water is considered kosher.