A muffin tin is a kitchen tool used for baking muffins and cupcakes. It typically has multiple small, round cups or wells, allowing you to bake several individual portions at once. Muffin tins come in various sizes, with the most common having 12 cups, but they can also be found in mini or jumbo sizes. Made from materials like metal, silicone, or non-stick coatings, muffin tins are designed to withstand high temperatures in the oven. They are versatile and can also be used for making other baked goods, such as brownies, mini quiches, or even frozen treats.