Ok kiddo, so a chess informant is like a big book or magazine that has lots of information about chess players and their games. Imagine you have a notebook where you write down all the cool things you learn about your friends at school. This is kind of like what a chess informant does, but instead of your friends, it's about chess players.
Inside the informant, there are lots of chess games that have been played by different players from all around the world. They write down all the moves that the players make, just like you might write down the rules to a new game you learn. Some of the games are really famous and some are not, but they are all really helpful for people who want to get better at playing chess.
They also have something called chess theory, which is like a guide to help people understand why certain moves are good or bad in specific situations. It's like getting helpful tips and tricks from a pro chess player.
So if you love chess and want to learn more about it, a chess informant is a great place to start. It's like having your own special notebook full of cool chess knowledge!