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A symbiotic relationship occurs between two living organisms where each individual benefits from the relationship. This type of relationship exists in different forms which are: mutualism, parasitism, and comensalism.
A parasitic relationship in a kind of relationship between two organisms where one of the individuals derives benefits from the other while the host only provides accomodation or so to say. In most cases, the hosts is drained and never benefits from the relationship. For example, ticks in a cow.
In mutualistic relationship, both of the species benefit from the interaction. For instance leguminous plants host bacteria in their root nodules. These bacteria inturn help to take nitrogen from the atmosphere for the plant.
In commensalism, one species benefits from the interaction but the other one is neither harmed not helped.