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Predation is the predator and prey relationship. Some example can be snake and rat, chicken and worm. 
Commensalism is a type of symbiosis wherein one is benefited and the other is neither benefited nor harmed. Examples can be shark and remora, orchid and tree.
Parasitism is a type of symbiosis wherein one is benefited while the other one is harmed. Examples of it can be lice and dog, tapeworm and human.
Competition is a symbiosis wherein organisms fight for survival. Everyone is competing.
Mutualism is a type of symbiosis wherein the two are benefited. Examples are termite and aphid, anabaena and azola. 
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