It's not just for children that hide the eggs, it has also become a tradition among developers hide content within a program or website. We call it "Easter eggs" in English, small jokes (often an animation, game, or a message) that are accessible only by typing a text a keystroke.
Apple is one of the first to have proposed such content. In 1987, they hide Easter Eggs built into the ROM of the Macintosh SE. They were typing "G 41D89A" keys in the debugger and appear to see a team photo on the screen:
Apple is one of the first to have proposed such content. In 1987, they hide Easter Eggs built into the ROM of the Macintosh SE. They were typing "G 41D89A" keys in the debugger and appear to see a team photo on the screen:
