Angiosperms, also known as flowering plants, are a large group of plants that produce flowers and seeds enclosed within a fruit. They are characterized by their ability to reproduce through flowers, which facilitate the processes of pollination and fertilization. Angiosperms are the most diverse group of land plants, comprising about 90% of all plant species, and play a crucial role in ecosystems as sources of food, habitat, and oxygen. Examples include trees, shrubs, grasses, and many ornamental plants.