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A jungle is land covered with dense vegetation. Application of the term has varied greatly during the last several centuries, both because of this ambiguity in the application of the term and its use in popular culture. Jungles in European and Western literature often represent a less civilised or unruly space outside the control of civilisation because of its association in colonial discourse with places that were colonised by Europeans.
The word jungle originates from the Sanskrit word jangala (Sanskrit: """"), meaning uncultivated land. Although the Sanskrit word refers to dry land, it has been suggested that an Anglo-Indian interpretation led to its connotation as a dense "tangled thicket" while others have argued that a cognate word in Urdu did refer to forests. The term is prevalent in many languages of the Indian subcontinent, and the Iranian plateau, where it is commonly used to refer to the plant growth replacing primeval forest or to the unkempt tropical vegetation that takes over abandoned areas.
One of the most common meanings of jungle is land overgrown with tangled vegetation at ground level, especially in the tropics. Typically such vegetation is sufficiently-dense to hinder movement by people, requiring that travelers cut their way through. This definition draws a distinction between rainforest and jungle, since the understorey of rainforests is typically open of vegetation due to a lack of sunlight, and hence relatively easy to traverse. Jungles may exist within, or at the borders of, rainforest in areas where rainforest has been opened through natural disturbance such as hurricanes, or through human activity such as logging. The successional vegetation that springs up following such disturbance of rainforest is dense and impenetrable and is a "typical" jungle. Jungle also typically forms along rainforest margins, such as stream banks, once again due to the greater available light at ground level.
Monsoon forests and mangroves are also commonly referred to as jungles of this type. Having a more open canopy than rainforests, monsoon forests typically have dense understoreys with numerous lianas and shrubs making movement difficult, while the prop roots and low canopies of mangroves produce similar difficulties.
Because European explorers initially travelled through tropical rainforests largely by river, the dense, tangled vegetation lining the stream banks gave a misleading impression that such jungle conditions existed throughout the entire forest. As a result it was wrongly assumed that the entire forest was impenetrable jungle. This in turn appears to have given rise to the second popular usage of jungle as virtually any humid tropical forest. Jungle in this context is particularly associated with tropical rainforest, but may extend to cloud forest, temperate rainforest and mangroves with no reference to the vegetation structure or the ease of travel.Source: Wikipedia