Dear little one, have you ever seen a picture of a hamburger with three lines on top of each other like this?
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That is what some people call a "hamburger button" because it looks like a hamburger with three buns! But it's not actually a real button you can eat, it's a button you can click on your computer or phone.
When you click on the hamburger button, it usually opens up a menu with more options. It's kind of like when you go to a restaurant and they give you a big menu, but then they also have a little "kids menu" with just a few choices. Clicking on the hamburger button is like opening up the kids menu to see what other options you have.
So, in short, the hamburger button is just a little symbol or button that helps you find more options on your computer or phone. It doesn't actually have anything to do with hamburgers!