An ecosystem is a community of living organisms, such as plants, animals, and microorganisms, interacting with their physical environment. These interactions create a complex web of relationships that sustain life. Ecosystems can vary in size and can be as small as a pond or as large as a forest. Ecosystems are essential for maintaining biodiversity and providing vital services, such as clean air, water, and food. They are influenced by factors like climate, soil, and human activity. Protecting ecosystems is crucial for the health of our planet and future generations.