Bananas are berries but strawberries are not.
According to botanists, true berries are simple fruits that stem from a single flower with a single ovary and typically have several seeds. This includes kiwis, pomegranates, eggplants, and yes, bananas. Strawberries, on the other hand, stem from a single flower with more than one ovary, which makes them aggregate fruits, along with raspberries and blackberries.