Cinco de Mayo ("5th of May" in English) is primarily a regional and not an obligatory federal holiday in Mexico. The date is observed in the United States and other locations around the world as a celebration of Mexican heritage and pride.A common misconception in the United States is that Cinco de Mayo is Mexico's Independence Day; Mexico's Independence Day is actually September 16 (dieciséis de septiembre in Spanish), which is the most important national patriotic holiday in Mexico.