Symbiosis describes a close and long-term interaction between different species. In a mutualism, both species benefit; in a commensalism, one species benefits while the other is not affected. In a parasitism, the parasitic species benefits, while the host species is harmed. Commensalism is a type of symbiotic relationship between two organisms where one of the organisms benefits greatly from the symbiosis relationship. The other organism is not helped but is not harmed also from the relationship. It is a one-sided symbiotic relationship.
Examples of this kind of relationship is between the cattle egrets and a cattle. The
While the cattle is grazzing it stir up insects, the cattle egrets eat the insects. The presence of cattle egrets do not harm or help the cattle, while the cattle egrets gain food. Hope this helps!