An Easter egg is a term used to describe an hidden feature or message in a computer program, video game, website, or other software. These are often created as a joke, for fun, or as a way to acknowledge the developers and designers who worked on the project. They can be found by entering specific commands or performing certain actions within the program, and can range from simple messages or images to complex games or puzzles. The term comes from the tradition of hiding decorated eggs during Easter celebrations, which are then hunted for by children.