A group of organisms of different species that live and interact together is referred to as a community.

Here's a breakdown:

* Species: A group of organisms that can interbreed and produce fertile offspring.

* Community: A collection of different populations of species living and interacting in a specific area.

* Ecosystem: A community of organisms interacting with their physical environment.

So, a community is a key component of an ecosystem, focusing on the interactions between different species within a particular environment.