Oh hi there! So, petit-beurre is a type of cookie that originally came from France.
Now, picture a cookie, like the ones you have with milk or for dessert after dinner. Petit-beurre is similar to that, but it's got a special shape – kind of like a square with rounded corners. And it also has a special pattern on the top, with little dots and lines.
Now, some people like to eat petit-beurre on their own, but it can also be used in lots of other yummy things. For example, you could crumble it up and sprinkle it over ice cream, or you could make a cake and use petit-beurre crumbs as part of the crust.
So that's petit-beurre – a cookie that looks kind of different from what you're used to, but is still really delicious and versatile!