In this essay I am going to explain what is Symbiosis. Symbiosis is close and often long-term interaction between two or more different biological species.The definition of symbiosis is controversial among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to any types of persistent biological interactions. Symbiotic relationships include those associations in which one organism lives on another, or where one partner lives inside the other. Symbiosis is also classified by physical attachment of the organisms, in which the organisms have bodily union is called conjuctive symbiosis. Also there is three kinds of Symbiosis; mutualism: The relationship between the flower and the bee. Commensalism: is a relationship between two species in which one species benefits while the other is not affected. And parasitism: is a relationship between to species in which one species benefits while the species it depends on, its host, is harmed. It connects to what we are learning because it connects to food webs because it relates to animals.