It was on May 5, 1862 that General Ignacio Zaragoza Seguin led and won the Battle of Puebla, and this is the reason why Cinco de Mayo is celebrated.
The Battle of Puebla had become significant and important in history because of two primary reason. First, the Mexicans was greatly outnumbered by the French. And two, after this battle, it's been said that no country in the Americas have been invaded by any other European military force.
In the United States, and in some parts of the world, Cinco de Mayo is a celebration of Mexican heritage and pride. Many however, mistake this date as Mexico's Independence Day, which rightfully falls on September 16.
Popular online Cinco de Mayo activities include downloading of coloring Cinco de Mayo printables for kids, an sample source of these are available for free here. Other parents and teachers also do arts and crafts activities at home and at school during this day.
For adults, Mexican recipes fill the dinner table today. Some of the Cinco de Mayo food favorites are burritos, enchiladas, tacos and quesadillas on this day. One source where you can get Cinco De Mayo recipes is available here.