An Easter egg is an intentional inside joke, a hidden message, or a secret feature of an interactive work.
A hidden message is information that is not immediately noticeable, and that must be discovered or uncovered and interpreted before it can be known.
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The name is used to evoke the idea of a traditional Easter egg hunt.
An egg hunt is a fun game during which decorated eggs or Easter eggs are hidden for children to find.
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The term was coined to describe a hidden message in the Atari video game Adventure that led Atari to encourage further hidden messages in later games, treating them as Easter eggs for players to find.
A video game is an electronic game that involves human or animal interaction with a user interface to generate visual feedback on a video device such as a TV screen or computer monitor.
Atari is a corporate and brand name owned by several entities since its inception in 1972, currently by Atari Interactive, a subsidiary of the French publisher Atari, SA.