Here's a breakdown:

* Commensalism: A relationship between two species where one species benefits from the interaction while the other species is neither harmed nor helped.

Example:

* Barnacles on whales: Barnacles attach themselves to the skin of whales, gaining a place to live and a free ride to new locations. The whales are not affected significantly by the barnacles.

Key Points:

* One species benefits.

* The other species is unaffected.

* The interaction is often passive.

Let me know if you'd like more examples of commensalism!