The pineapple is a species of bromeliad (Bromeliaceae), a family naturally confined to the Americas. It arrived in Britain as aprt of the Colombian exchange and became a highly prized fruit that was grown is special heated frames. Nowadays it has become a cheap fruit readily available in supermarkets.
Botanically the pineapple is a compound fruit formed from many fused berries. It is held on a terminal inflorescence which retains a growing point at the tip which roots readily and can be used to propagate the plant however propagation is usually from natural divisions that form at the base of the original rosette after it has flowered.