mutualism

An association between two organisms of different species in which each member benefits.

A symbiosis in which two organisms living together mutually and permanently help and support one another.

Lichens are examples among plants.

The doctrine of mutual dependence as the condition of individual and social welfare.

any interaction between two species that benefits both; typically involves the exchange of substances or services

the relation between two different species of organisms that are interdependent; each gains benefits from the other