A junk is an ancient Chinese sailing vessel/ship design still in use today. Junks may have developed from very early bamboo rafts which had a high stern. Cromagnon cave paintings on the Indo China coast show junk shaped doublehull vessels. Junks were developed during the Han Dynasty (206 BC–220 AD) and were used as seagoing vessels as early as the 2nd century AD. They evolved in the later dynasties, and were used throughout Asia for extensive ocean voyages. They were found, and in lesser numbers are still found, throughout South-East Asia and India, but primarily in China, perhaps most famously in Hong Kong. Found more broadly today is a growing number of modern recreational junk-rigged sailboats.
The term junk may be used to cover many kinds of boat—ocean-going, cargo-carrying, pleasure boats, live-aboards. They vary greatly in size and there are significant regional variations in the type of rig. To Western eyes, however, they all appear to resemble one another due to their most significant shared feature, their fully battened sails.
The above photoset showing Chinese junks criss-crossing the Hong Kong Harbour area is photographed by Karsten Petersen in 1974 og 1977 – © Karsten Petersen – http://global-mariner.com/