The plant kingdom, also known as Plantae, includes a diverse group of living organisms that are primarily characterized by their ability to perform photosynthesis. This process allows plants to convert sunlight into energy, using carbon dioxide and water. Plants are essential for life on Earth, as they produce oxygen and serve as the foundation of most ecosystems. Plants are classified into various groups, including mosses, ferns, conifers, and flowering plants. They can be found in nearly every habitat, from forests and grasslands to deserts and aquatic environments. The plant kingdom plays a crucial role in maintaining ecological balance and supporting wildlife.