April Fools' Day or All Fools' Day is a day celebrated in many countries on April 1. The day is marked by the commission of hoaxes and other practical jokes of varying sophistication on friends, family members, enemies, and neighbors, or sending them on a fool's errand, the aim of which is to embarrass the gullible. Traditionally, in some countries, such as the UK, Australia, New Zealand, and South Africa the jokes only last until noon, and someone who plays a trick after noon is called an "April Fool". Elsewhere, such as in Ireland, Russia, France, the Netherlands, Canada, and the U.S., the jokes last all day.

April Fool's Day coloring pages are a popular activity for early school children to learn about the history of this day.