Okay, so a kimchi burger is like a regular burger but with a different kind of topping. You know how when you eat a burger, you might put ketchup or mustard on it? Well, instead of that, people who make kimchi burgers use something called kimchi. Kimchi is a food that comes from Korea and is made with vegetables like cabbage, carrots, and radishes. It's really spicy and sour and it can be eaten on its own or used as a topping for other foods.
So, when you order a kimchi burger, you get a regular burger patty (like the kind you might get at a fast food restaurant), but instead of putting ketchup or mustard on it, they put a scoop of kimchi on top. It might also have other things on it like cheese, lettuce, and tomato.
Some people really like kimchi burgers because they like the spicy taste of the kimchi. Others might not like it as much because it's really different from the kind of burgers they're used to. But, it's always good to try new things and see what you like!