A pineapple is neither an apple nor a pine!

In fact, it’s a berry! A pineapple is a tropical plant of multiple edible fruits consisting of coalesced berries, named for its resemblance to the pinecone.

It is considered a multiple edible fruit because it is formed from a cluster of flowers, in which the inflorescence produces a fruit and matures into a single mass. A pineapple is simply a large berry misnamed because of its appearance!

(Source)