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Redwoods are among the world's tallest living trees. They are 60 to 85 metres in height and 2.5 to 4 metres in diameter. A redwood in northern California is the tallest-known tree in the world - it is about 110 metres high. 

It is called a redwood because of the red colour of its wood. The redwood grows along the west coast of the United States, from central California to southern Oregon. 

The redwood is also called as Coast or California redwood. It belongs to taxodium family, Taxodiaceae. It is classified as Sequoia sempervirens.