Whats the definition of parasitism and commensalism and examples?

Parasitism - is a non-mutual relationship between species, where one species, the parasite, benefits at the expense of the other, the host

examples - plants and animals

Commensalism - in biology, a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter.

examples - egrets and cattle

Parasitism - where one organism benefits and causes harm t the other organism. Example (tapeworms which live in their host)

Commensalism - Where one organism benefits while the other organism is not being harmed. Example (relationship between a sea anemone and clown fish)