Symbiotic relationships refer to interactions between two different species in which both organisms benefit from their association. These relationships can be classified into three main types: mutualism, where both species benefit; commensalism, where one species benefits and the other is unaffected; and parasitism, where one species benefits at the expense of the other. Symbiotic relationships are common in nature and play a key role in maintaining ecosystems and promoting species diversity. Research in this area seeks to understand the mechanisms underlying these interactions, their ecological and evolutionary significance, and how they can be influenced by environmental changes.