Okay, so imagine you have juice from some fruits like grapes or apples. Now, imagine you leave it for a few days, and something magical happens in the juice. This magic is called fermentation, and it's when tiny organisms called yeast break down the sugar in the juice and turn it into alcohol.
Now, if you take this alcohol and distill it (which means you heat it up so it evaporates and then cool it back down so it becomes liquid again), you can make something called brandy. This is a special kind of alcohol that has a stronger flavor and is usually more expensive than other types of alcohol.
Chacha is a specific type of brandy that comes from the country of Georgia. They make it by distilling the juice of grapes, but sometimes they also use other fruits like plums. Chacha has a unique taste and smell, and some people really like it! However, like any alcohol, it's important to drink it responsibly and not have too much at once.