Okay little buddy, let's talk about malolactic fermentation.
You know how when you eat something sour or tart like a lemon, your mouth puckers up? Well, that's because of something called acid. Acid is what makes things taste sour or tart.
Now, when grapes are turned into wine, they have a lot of acid in them. If the wine tastes too acidic, it isn't very enjoyable to drink. That's where malolactic fermentation comes in!
Malolactic fermentation is when a type of bacteria called Oenococcus oeni is added to the wine. This bacteria eats a different kind of acid called malic acid and turns it into a softer, creamier acid called lactic acid. Lactic acid is much nicer to taste and gives the wine a smooth, buttery flavor.
So basically, malolactic fermentation is when the bacteria is added to the wine to make it taste better when the wine has too much acid. It's like adding sugar to your lemonade to make it taste better!