High Quality Content by WIKIPEDIA articles! April Fools` Day is celebrated in different countries around the world on April 1 every year. Sometimes referred to as All Fools` Day, April 1 is not a national holiday, but is widely recognized and celebrated as a day when many people play all kinds of jokes and foolishness. The day is marked by the commission of good-humoured or otherwise funny jokes, hoaxes, and other practical jokes of varying sophistication on friends, family members, teachers, neighbors, work associates, etc.