Commensalism
Mutualism
Parasitism
Predation
Commensalism: A type of relationship between two organisms where one benefits and the other is neither harmed nor benefited. An example of this is barnacles attaching themselves to whales, using them as a surface to live on without harming the whale.
Mutualism: A type of relationship between two organisms where both benefit from the interaction. An example of this is the relationship between flowering plants and their pollinators, where the plant receives the benefit of pollination and the pollinator receives nectar or pollen as food.
Parasitism: A type of relationship between two organisms where one benefits (parasite) at the expense of the other (host). An example of this is ticks feeding on the blood of animals, weakening the host and potentially spreading diseases.
Predation: A type of relationship where one organism (predator) hunts, kills, and consumes another organism (prey) for food. An example of this is a lion hunting and killing a zebra for food.