Taco Day is holiday that celebrates Mexico’s most popular food. The word taco is spanish for sandwich, and the taco is the Mexican version of the sandwich. After being popular in Mexico for thousands of years, the taco traveled to the United States, where is it gained incredible popularity and many different varieties. Celebrate Taco Day by eating tacos for breakfast lunch and dinner. Or you can through a taco party and make tacos for all of your family and friends.