Evergreens are plants that retain their green leaves throughout the year, regardless of the season. Unlike deciduous trees, which lose their leaves in autumn, evergreens maintain their foliage, allowing them to photosynthesize and grow even in winter. Common examples of evergreens include pine trees, spruce trees, and holly. These plants are well-adapted to various climates, often thriving in colder regions where other plants may struggle. Evergreens play a crucial role in ecosystems by providing shelter and food for wildlife. They are also popular in landscaping and gardening for their year-round greenery and low maintenance needs.