Muffins are a thing you eat and are commonly eaten for breakfast. There are many varities and flavors such as blueberry, chocolate chips, carrot, peach, strawberry. Outside the United States of America, muffin can also refer to a disk-shaped muffin, usually called an, English Muffin outside of England. Some muffins are somewhat like small cakes or cupcakes in shape, although they usually aren't as sweet as cupcakes and lack frosting. Cornbread muffins, also exist.
Chocolate chip muffins

Chocolate chip muffins cooking in a oven.