Epiphytes are plants that grow on other plants, typically trees, without causing them harm. They obtain their sustenance and water from the atmosphere and precipitation, rather than from the host plant. The interaction between epiphytes and a mango tree exemplifies commensalism, a symbiotic relationship where the epiphyte benefits from the host plant without causing any damage. The mango tree neither benefits from nor is harmed by the presence of the epiphytes.Therefore, the correct classification is Commensalism.