A berry is a fleshy fruit with one ovary that is formed from a single flower.
Two good examples are bananas and grapes.
The most common variety of fleshy fruit is the berry, which ripens the complete ovary wall into an edible pericarp.
Carpels can have one or several.
The seeds are normally implanted in the ovary’s fleshy centre, however, some non-fleshy exceptions, including peppers, have air surrounding the seeds instead of pulp.
Final answer: A berry fruit is mostly fleshy and multi-seeded.