what are berries
While we've tended to define berries as any small edible fruit, the official definition of a berry is a fleshy fruit produced from a single ovary.  By this definition, oranges, kumquats, blueberries, and even tomatoes can be considered part of the berry family. Strawberries, on the other hand, are known as accessory fruits, which makes it sound like they did something wrong. They're just trying to exist, man! In these fruits, the surrounding flesh around the seed isn't derived from the fruit's ovaries but from the receptacle in which the ovaries are found.