Simply put, a berry is a fleshy fruit. However, botanically speaking, a berry is defined as a fruit with a fleshy, edible pericarp, or fruit wall, that originates from a single piston and encases one or many seeds. In the botanical sense, a tomato is a berry and a strawberry is not. However, many fruits that are otherwise classified in botany are more widely accepted as berries even if they are not true berries.

Examples of true berries are the grape, tomato, persimmon, papaya, and pomegranate. Though commonly considered to be berries, strawberries, raspberries, blackberries, and boysenberries are not technically berries. To eliminate confusion, common speech and culinary use define a berry as any small, sweet or juicy fruit.

A berry-bearing plant is classified as bacciferous. Berries are generally bright in colour and contrast with the green of the plant from which they grow. This is nature's way of self-preservation, as the berries are attractive to animals, which in turn eat the berries, digest the fruit and dispel the seed elsewhere in their waste. Similarly, the berry is attractive to people, especially young children, though some berries are toxic to people.

From a culinary standpoint, berries of many kinds and classifications make excellent ingredients for pies and other baked goods. The sweet flavour and fleshy texture of a berry work nicely in fruit pies, spreads, and toppings for ice cream, or as an additive to pancakes, muffins, and crepes. Many berries are good by themselves as a healthy snack. The most commonly consumed berries are strawberries, raspberries, and blueberries, and they contain many vitamins and nutrients. Mid-summer is the ideal season for purchasing the ripest berries in supermarkets and farmers' markets.