Green plants, also known as photosynthetic organisms, are living organisms that use sunlight to produce their own food through a process called photosynthesis. They contain a green pigment called chlorophyll, which helps capture sunlight and convert carbon dioxide and water into glucose and oxygen. This process is essential for life on Earth, as it provides energy for plants and oxygen for other living beings. Green plants are classified into various groups, including mosses, ferns, conifers, and flowering plants. They play a crucial role in ecosystems by providing habitat, food, and oxygen. Additionally, they help regulate the climate and maintain soil health, making them vital for the planet's overall well-being.