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Botanically speaking, a fruit is a seed-bearing structure that develops from the ovary of a flowering plant, whereas vegetables are all other plant parts, such as roots, leaves and stems, according to LiveScience.
A tomato is both a fruit and a vegetable, depending how (and why) you want to look at it. Botanically, it's the fruit of the tomato plant. For purposes of human consumption, though, it's primarily a vegetable. It's not generally eaten in the same way as a fruit like a banana or apple. It tends to be eaten more like a vegetable like onion or lettuce.