An evergreen tree is a type of tree that retains its leaves throughout the year, rather than shedding them in the fall. Common examples include pine, spruce, and fir trees. These trees are adapted to various climates and can be found in many regions around the world, from cold northern areas to warm tropical zones. Evergreen trees play a vital role in the ecosystem by providing habitat and food for wildlife. They also help in reducing soil erosion and improving air quality. Many evergreen species are used for timber, paper production, and as ornamental plants in landscaping, making them economically important as well.