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Commensalism benefits one organism and the other organism is neither benefited nor harmed. It occurs when one organism takes benefits by interacting with another organism by which the host organism is not affected. A good example is a remora living with a shark. Remoras eat leftover food from the shark.
There are several types of symbiosis. Parasitism is a symbiosis where one organism causes harm to the other, its host. An example of this is a disease causing bacterium, such as Treponema pallidum, which causes the disease syphilis in humans. Commensalism is a symbiosis where one organism benefits and the other is not harmed or helped.