A tree is a perennial plant that has a trunk, branches, leaves, and roots. Trees play a crucial role in the environment by providing oxygen, absorbing carbon dioxide, providing habitat for wildlife, and preventing soil erosion. They come in a variety of shapes, sizes, and species, with some trees living for hundreds or even thousands of years. Trees are also valuable for their wood, which is used for building, furniture, paper, and other products. Overall, trees are an essential part of the ecosystem and contribute to the beauty and health of our planet.