Here's a breakdown:

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

Examples of Commensalism:

* Barnacles on whales: Barnacles attach themselves to whales, gaining a free ride and access to food. The whale is not affected by the barnacles.

* Egrets and cattle: Egrets follow cattle, catching insects that are disturbed by the cattle's movement. The cattle are unaffected.

* Remora fish and sharks: Remora fish attach themselves to sharks, feeding on scraps of food and getting a free ride. The shark is not harmed by the remora.

It's important to note that the line between commensalism and other symbiotic relationships can sometimes be blurry. For example, some relationships that appear to be commensal might actually involve a very small negative impact on the "unaffected" organism, which would then classify it as amensalism.