Plants are categorized into several groups based on their characteristics. The main groups include mosses, ferns, gymnosperms, and angiosperms. Mosses are non-vascular plants that thrive in moist environments, while ferns are vascular plants that reproduce through spores. Gymnosperms, like pine trees, produce seeds that are not enclosed in fruit, whereas angiosperms, such as flowers, produce seeds within fruits. Each plant group plays a vital role in ecosystems. For example, mosses help retain moisture in the soil, ferns provide habitat for various organisms, gymnosperms contribute to timber production, and angiosperms are essential for food production and pollination. Understanding these groups helps us appreciate plant diversity and their ecological importance.