Meaning types of interaction between living organisms?

There are 3 types of interactions between living organisms. Prey-predator relations have one organism being the hunted and the other being the hunter. SymbiOSis is the term used to describe different species of organisms living together. SymbiOSis is broken down into 3 categories. Mutualism is where both individuals benefit from the relationship. Commensalism is where one organism benefits and the other is not significantly harmed or helped. Parasitism is where one organism benefits to the detriment of the other. The third type of interaction is competition. Competition occurs when the fitness of one is lowered by the presence of another.