What is name given for an association of two species where one is benefited and or remains unaffected or unharmed? 

Predation is an interaction where a predator (an organism that is hunting) feeds on its prey (the organism that is attacked). Parasitism is a non-mutual symbiotic relationship between species, where one species, the parasite, benefits at the expense of the other, the host. Symbiosis is close and often long-term interaction between two different biological species. Commensalism is a class of relationships between two organisms where one organism benefits from the other without either harming or benefiting the latter.