Tree - Perennial woody plants (Video Encyclopedia)

Trees are perennial plants with stems that grow long, supporting branches and leaves in most species.
In some usages, the definition of tree may be narrower, usually referring only to woody plants with secondary growth, plants that can be used as lumber, or plants that grow to a certain height.
In a broader definition, palms, ferns, bananas and bamboo are also types of trees.
Trees are not a taxonomic group but include a variety of plant species that develop trunks and branches as a way to tower over other plants to compete for sunlight to stay alive.
Trees tend to be long-lived, some trees can live up to several thousand years.
Trees have grown on Earth for at least 370 million years.
It is estimated that there are around three trillion mature trees in the world.

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