Easter Eggs have become a highly popular addition of to a large amount of games over the years. The name has absolutely no influence on what they mean in reference to video games. In a video game, an easter egg means some kind of hidden item that can often be some kind of joke or secret that is generally unrelated to the core content of the game.
For example, lets say you are playing a shooter that is set during WW2, which means it is set around the 1940s. If you come across some secret area that contains a LCD tv in a room, this would be considered an easter egg since it is something that is completely out of place for the games setting.
One of the first ones I ever discovered was in the Ocarina of Time. The first time you get to the castle and talk with Zelda, you can see pictures of Mario from the Super Mario series in her bedroom window Back then, I thought it was cool, but it didn’t make much sense to me back then. This a classic example of an easter egg.
Over the past 20 years, there have been countless easter eggs in all kinds of video games. Perhaps Duke Nukem 3d, being one of the very early 3d games, was one of the games to get this started. This game contained quite a few easter eggs such as references to Doom guy and Serious Sam.
I mentioned at the start that Easter eggs are not actually easter eggs. Grand Theft Auto: Vice City is one exception where there is a secret easter egg, that is actually a chocolate easter egg. You can’t do anything with it, but it is a nice piece of trivia!