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A fruit is the mature ovary of a seed plant, usually developed from a flower. Fruits have seeds so they further the reproductive cycle. A vegetable is a plant or that part of a plant which is edible, and does not necessarily have a role in the plant's reproductive cycle.
Even though most people identify squash with vegetables, from a botanical standpoint, they're considered fruits because they contain the seeds of the plant. Squash are divided into two categories -- summer and winter squash.