Evergreen trees are types of trees that retain their leaves throughout the year, rather than shedding them in the fall. This characteristic allows them to maintain their green appearance in all seasons. Common examples of evergreen trees include pine, spruce, and fir. These trees are well-adapted to various climates, often thriving in colder regions where deciduous trees may lose their leaves. Their needle-like leaves are designed to reduce water loss, making them resilient in harsh conditions. Evergreen trees play a vital role in ecosystems, providing habitat and food for wildlife.