The interaction between the orchid plant and the mango tree can be described as epiphytism, which is a form of commensalism. Epiphytism is a type of symbiotic relationship where one organism (the epiphyte) grows on the surface of another organism (the host), without causing any harm or benefit to the host.
In this case, the orchid plant is the epiphyte, and the mango tree is the host. The orchid plant attaches itself to the bark or branch of the mango tree and obtains nutrients and support from the host, without harming or benefiting the tree in any significant way. The orchid plant is able to access sunlight and moisture in the canopy where it grows, while the mango tree is unaffected by the presence of the orchid.