A berry is a type of fruit. Berries are usually small, juicy, and of a bright color contrasting with their background to make them more noticeable to the animals that disperse them and thus scatter the seeds of the plant.
They have one or more carpels within a thin covering and very fleshy interiors, with the seeds embedded in the common flesh of a single ovary. Examples of berries include guavas, tomatoes, blueberries and blackcurrants.
In everyday speech and in cookery (as distinct from botany), the term "berry" refers to small, sweet fruits: in this sense, the strawberry is a berry and the tomato is not.