A nut is a fruit consisting of a hard or tough nutshell protecting a kernel which is usually edible. In general usage and in a culinary sense, a wide variety of dry seeds are called nuts, but in a botanical context "nut" implies that the shell does not open to release the seed (indehiscent).
Chestnuts are both botanical and culinary nuts.
Nuts being sold in a market
Raw mixed nuts, sold as a snack food
Image: Almonds in shell, shell cracked open, shelled, blanched
In botany, a fruit is the seed-bearing structure in flowering plants that is formed from the ovary after flowering.
Various fruits arranged at a stall at the Municipal Market of São Paulo
Fresh fruit mix of blackberries, strawberries, and raspberries
An arrangement of fruits commonly thought of as culinary vegetables, including corn (maize), tomatoes, and various squash
Pomegranate fruit – whole and piece with arils