Banana's are berries.
They are derived from a single flower with more than one ovary, making them an aggregate fruit. True berries are simple fruits stemming from one flower with one ovary and typically have several seeds. Tomatoes fall into this group, as do pomegranates, kiwis and—believe it or not—bananas.
Strawberries are not berries.
Technically, the strawberry is an aggregate accessory fruit, meaning that the fleshy part is derived not from the plant's ovaries but from the receptacle that holds the ovaries. Each apparent 'seed' (achene) on the outside of the fruit is actually one of the ovaries of the flower, with a seed inside it.
This is proof that we live in an alternate reality.