Tropical rainforest is one of the Earth`s most spectacular natural wonders and are the oldest living ecosystem on Earth. The tropical rainforests are considered as the most complex biome (structure and species diversity) on Earth and they are actually such a place of wilderness, where lots of trees and few people live together. They are called as tropical rainforests, as they grow in those parts of the world where there is heavy rainfall throughout the year.

The tropical rainforests can be characterized by high rainfall, with rainfall of 100-600 cm a year. The soil in these forests can be soft and with less resistance power, because high rainfall tends to leach out the soluble nutrients. These forests flourish in or near the tropics, the hot regions that lay either side of the equator and the atmosphere in a tropical rainforest is permanently humid - hot and damp. The tropical rainforests are often referred to as jungles in India, which is a Hindi word meaning wilderness. A true jungle is a thick mesh of vegetation, through which people have to force and cut their way. Though the tropical rainforests contain patches of jungle, they are more open. The tropical rainforests have between five and twenty times as many species of trees as one in the temperate zone of North America or Europe. They also provide a home for many of the world`s most fascinating animals.

The tropical rainforests contain a vast variety of substances potentially useful to humans. Many of the human foods and medicines and also much of useful timber, are collected from them. All the products like coffee, chocolate, bananas, mangoes, papayas, avocados and sugar cane originally came from tropical rainforests, and are still mostly grown on plantations in regions that were formerly primary forest. The trees in the tropical rainforests are very tall and broadleaved evergreens and the floor of the forests remain covered with the rotting leaves. The tallest trees have buttress roots and wing-like growths that spread out from the base of the trunk to act as props. The other trees have stilt roots that grow down from the trunk or branches, often in graceful arches. All the trees in these forests carry their branches and leaves at the top of long slender trunks, forming a huge umbrella-like green canopy. The dense canopy filters much of the daylight and leaves a shady green world beneath it.

The tropical rainforests contain more diverse species of plants and animals than any other part of the world, even more than the oceans that cover nearly three-quarters of the earth. The rainforests give shelters to two-thirds of all the living animal and plant species on the planet. It has been estimated that hundreds of millions of new species of plants, insects, and microorganisms are still undiscovered and yet unnamed by science. The tropical rain forests are also called the "jewel of the earth", and the "world`s largest pharmacy", as large amount of natural medicines have been discovered there, so far. A large amount of prescription drugs sold worldwide come from plant-derived sources in the tropical rainforests and the scientists believe that the cures for many more diseases will be discovered there in the future.

Several common characteristics can be found in the trees of tropical rainforests. The tropical rainforest species frequently possess one or more attributes not commonly seen in trees of higher latitudes or trees in drier conditions on the same latitude. Some of the most notable plants found in the tropical rainforest include the Bengal Bamboo, Bougainvillea, Curare, Coconut tree, Durian, Jambu, Kapok tree, Mangrove forests, Strangler figs, and Tualang. While, the Bengal Bamboo is found at the Southern of Asia, the Bougainvillea is found in South America and the Coconut tree is found in hot places like Africa and Asia. The Durian is found in southern Asia; the Jambu somewhere in southern India to eastern Malaya, the Kapok tree in the emergent in the South of Asia and the Mangrove forest is found in the south of Asia. While the Strangler fig is found in southern Asia, the Tualang is found in southern Asia.

Many tree species found in the tropical rainforests have broad, woody flanges (buttresses) at the base of the trunk. Large leaves are common among the trees and shrubs of the forest floor layers and the young trees destined for the canopy and emergent layers also sometimes have large leaves. The large leaves surfaces help intercept light in the sun-dappled lower strata of the forest. The canopy leaves are usually smaller than those found in understory plants and are divided to reduce wind damage. The trees are often well connected in the canopy layer, especially by the growth of woody climbers known as lianas, or by plants with epiphytic adaptations.

The other principal characteristics of the trees in tropical rainforests include exceptionally thin bark. The bark is often only 1-2 mm thick and it is usually very smooth, although sometimes covered with spines or thorns. Another common tree in tropical rainforests is Cauliflory that flowers and hence fruits directly from the trunk, rather than at the tips of branches. Large fleshy fruits that attract birds, mammals, and even fish as dispersal agents, are also a common characteristic of the trees in tropical rainforests. At present, one of the largest economic values of tropical rainforests comes in the form of tourism. People travel both nationally and internationally to experience rainforests firsthand. The economic benefits of tourism are the most promising way in which rainforests may be preserved.