A rambutan (Nephelium lappaceum) is a tree from southeast Asia. The fruit that grows on the tree is also called rambutan. It is in the same family as Lychee.
The name rambutan is a word that means "hairy". The fruit does look hairy. The fruit is green in color when not yet ripe. Once ripe the outside of the fruit turns red. The flesh on the inside of the rambutan is white in color.