A relationship between two different living things living close to one another and depending on each other benefiting from each other in particular ways.Or Symbiosis is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasitic. The organisms, each termed a symbiont, may be of the same or of different species.Or A relationship between two people, organizations, etc. that benefits them both.