For the electrical device that produces light, see Lightbulb.
Shallots--a type of bulb that people use for food.
A bulb is the part of some plants, mostly under the dirt, that stores food while the plant is resting from growing (a storage organ).
Some well-known bulbs people grow to use as food are onions and garlic. Some bulbs grown for the decorative flowers are the lily, tulip, and some irises.