Imagine that you are trying to find a hidden treasure in a video game or a movie. This hidden treasure is called an "Easter Egg". It is called an Easter Egg because it is hidden just like an Easter egg that is hidden during Easter.
An Easter egg in a movie or a video game is something that is hidden and that you have to go on a little treasure hunt to find. Easter eggs can be anything like a hidden message or a secret reference to something else.
For example, in some movies, you might see a secret message written on a wall in the background of a scene. In a video game, you might need to do something special like press a certain button or go to a secret corner of the game to find a hidden object or get a special power-up.
Easter eggs are fun to find because they make you feel like you have discovered something that no one else knows about. They are like little surprises waiting to be found.