A muffin tin is a kitchen tool used for baking muffins and cupcakes. It typically has multiple small, cup-shaped indentations, allowing you to bake several muffins at once. Muffin tins are usually made of metal, silicone, or non-stick materials, which help ensure easy removal of baked goods. Muffin tins come in various sizes, with the standard size holding 12 muffins. They can also be found in mini or jumbo sizes, catering to different baking needs. Using a muffin tin helps create evenly shaped muffins, making them visually appealing and easy to serve at gatherings or events.