Why do Jew's have horseradish on Passover?

The main reason Jews eat Matzoh in Passover to commemorate the Jews' exodus from Egypt. Since the Jews were forced to leave in a haste they hadn't had time to wait for the bread dough to rise and as a result the bread was flat. Therefore, Jews eat Matzoh to remember the exodus. Jews start eating Matzoh on the first night of Passover at the Seder meal until the end of passover. All other products made of grains are prohibited during the holiday, but some secular Jews do not abide by this prohibition. This is one of the Jewish customs in Passover that symbolizes freedom and humility for the Jewish people.