The primary function of an ecosystem is to support and sustain the interactions among living organisms and their physical environment. Ecosystems provide essential services such as nutrient cycling, energy flow, and habitat for various species. They regulate climate, purify water, and decompose waste, maintaining the balance necessary for life. Additionally, ecosystems foster biodiversity, contributing to resilience against environmental changes. Each ecosystem, whether terrestrial or aquatic, has its unique characteristics and functions, highlighting the interconnectedness of living organisms and their roles within various ecological communities.