What is commensalism? Give an example

Explanation

Commensalism is referred to as the interaction between two species where on one species is benefited and the other is neither harmed nor benefited, e.g.,
1) An orchid growing as an epiphyte on a mango tree. The orchid gets shelter and nutrition from mango tree, while the mango tree is neither benefited nor harmed.
2) Barnacles growing on back of whale.
3) Cattle egret and grazing cattle.
4) Sea anemone with stinging tentacles and the clown fish.