There are several types of symbiotic relationships, including mutualism, commensalism, and parasitism.
Mutualism is an association between two different species which benefits each species.
Commensalism is a relationship between two species in which one species obtains food, shelter, support, locomotion, or another benefit from the other, without harming or benefiting it. Parasitism is a relationship between two species in which one benefits at the expense of the other, without killing it. Paul Arthur Berkman.