Angiosperms are a group of flowering plants that produce seeds enclosed within a fruit. They are the most diverse and widespread group of plants on Earth, with over 300,000 species. Angiosperms play a crucial role in ecosystems, providing food, shelter, and oxygen for various organisms. These plants are characterized by their flowers, which facilitate reproduction by attracting pollinators like bees and birds. The seeds develop from fertilized ovules within the ovary of the flower, and the surrounding fruit aids in seed dispersal. Examples of angiosperms include roses, oak trees, and grasses.