Jungle

Jungle usually refers to a dense forest in a hot climate, such as a tropical rainforest. The word Jungle originates from the Sanskrit word Jangala which means a desert or uncultivated land. The term Jungle is prevalent in many colloquial languages of the Indian subcontinent and generally used to refer a dense tropical forest or a swamp. About 6% of the Earth's land mass is classified as jungle. Jungles are vital to sustaining the ecosystems of the Earth as we know it. About 57% of all species live in jungle environments. The term may still be used in a technical context to describe the forest biome rainforest, a forest characterised by extensive biodiversity and densely tangled undergrowth including the young trees, vines and lianas, and herbaceous plants. As a forest biome, "jungles" are present in both equatorial and tropical climatic zones, and are associated with preclimax stages of the rainforest. Jungle is to be distinguished from tropical rainforest in that the former is a profuse thicket of tropical shrubs, vines, and small trees growing in areas outside the light-blocking canopy of a tropical rainforest. Hence, 'jungle' is often found at the edges of climax rain-forests, where human activity may increase sunlight penetration.

Not all regions called "jungles" would qualify as "rain forests" because many would apply "jungle" to the forests of northern Thailand or southern Guangdong in China: but scientifically, these are "monsoon forests" or "tropical deciduous forests" but not "rain forests".

(wikipedia.org)