From Wikipedia:

The Jackfruit (Artocarpus heterophyllus) is a species of tree and its fruit native to southwestern india and possibly also east to the malay peninsula though more likely an early human introduction there.

It is a small evergreen tree growing to 10-15 m tall. The leaves are alternately arranged, elliptical, 5-25 cm long and 3-12 cm broad, often lobed on young trees but entire on mature trees. The flowers are  3-7 cm long and 1-2.5 cm broad; the male and female flowers produced on separate inflorescences, the female inflorescences commonly borne on thick branches or the trunk of the tree..

The fruit is huge, seldom less than about 25cm in diameter. Even a relatively thin tree (circa 10 cm) can have these huge fruits hanging on it. The fruits can reach 36kg in weight and up to 90cm long and 50 cm in diameter.

The sweet yellow sheaths around the seeds are about 3-5mm thick and have a taste similar to pineapple but milder and less juicy.

The English name jackfruit derives from Portuguese jaca, which is derived from chakka.