Ecosystems are complex networks of living organisms, their physical environment, and the interactions between them. They can be as small as a puddle or as vast as the ocean, encompassing various habitats like forests, deserts, and wetlands. Each ecosystem plays a crucial role in maintaining the balance of nature, supporting biodiversity, and providing essential services such as clean air and water. In an ecosystem, every organism, from the smallest microbe to the largest predator, has a role to play. These interactions create a web of life that sustains the environment. Understanding ecosystems helps us appreciate the importance of conservation and the impact of human activities on our planet.