Look at the title of the text, the introduction. What is April Fool's Day, and how is it celebrated? Where did the April Fool's tradition come from? Watch the video and read the text to find out.

April Fool's Day is a day where you play practical jokes on people. When you've tricked them, you shout "April Fools!" to let them know it was a joke. Nobody really knows for sure where the tradition came from, but there are many theories.