The biosphere is the global sum of all ecosystems, representing the zone of life on Earth. It includes all living organisms, such as plants, animals, and microorganisms, along with their interactions with the atmosphere, hydrosphere, and lithosphere. The biosphere is essential for maintaining ecological balance and supporting life. This zone extends from the deepest ocean floors to the highest mountain peaks, encompassing various habitats like forests, deserts, and wetlands. The biosphere plays a crucial role in processes like photosynthesis, which produces oxygen, and nutrient cycling, which sustains ecosystems. Understanding the biosphere is vital for conservation efforts and addressing environmental challenges.