Every Cinco de Mayo, Rosa and her family cheer at a parade and enjoy delicious Mexican food. But what exactly is Cinco de Mayo? Although many people think May fifth marks Mexico's independence, the holiday is actually the anniversary of a decisive battle against foreign occupiers. Today, Cinco de Mayo is celebrated by many. Follow Rosa, a vivacious Mexican-American girl from California, as she learns about he heritage and celebrates the holiday with her family, friends, and community.