An ecosystem is a community of organisms and their physical environment interacting together. Environment involves both living organisms and the non-living physical conditions. These two are inseparable but interrelated. The living and physical components are linked together through nutrient cycles and energy flows.
An ecosystem may be of very different size.
Ecosystem boundaries are not marked (separated) by rigid lines.
Source: Melissa Murray. (2018). What is an ecosystem? Australian Museum. Link
Ecosystems are “socio-ecological systems”, where diverse and interconnected actors are intricately tied by cultural practices, identities, intentions, roles, beliefs, values, and available resources. In this understanding, ecosystems yield societal value that transcends the capacity and intentions of individual actors.