An ecosystem is a biological community of interacting organisms (biotic components) and their physical environment (abiotic components). These systems encompass the complex interactions between organisms, such as predation and competition, and the flow of energy and cycling of matter within a specific geographic area. Energy flows unidirectionally through an ecosystem, typically entering from solar radiation, while matter cycles through various biogeochemical pathways, such as the carbon and nitrogen cycles. The stability and function of an ecosystem are determined by the interdependence of its various biotic and abiotic factors, making them fundamental units for studying global ecological processes.