Quoted from Wikipedia a hammock is a sling of fabric, rope or netting suspended between two points, used for swinging, sleeping or resting. It is normally consist of one or more cloth panel or a woven network of twine or thin rope stretched with ropes between two firm anchor points such as tree or posts. Hammocks were developed by native inhabbitants of Central and South America for sleeping. Later they were used aboard ships by sailors to enable comfort and maximize available space, and by explorers or soldiers travelling in wooded regions and eventually by parents in the 1920s for containing babies just learning to crawl. They are popular around the world today  for relaxation and used as a lightweight bed on camping trips. The hammock is often seen as symbol of summer, leisure, relaxation and simple, easy living.

Hammock stand without nettting Hammock with netting