Symbiosis is a biological term that describes the close and long-term interaction between two different species. This relationship can be beneficial, neutral, or harmful to one or both parties involved. There are three main types of symbiosis: mutualism, where both species benefit; commensalism, where one species benefits while the other is neither helped nor harmed; and parasitism, where one species benefits at the expense of the other. An example of mutualism is the relationship between bees and flowers. Bees collect nectar from flowers for food while simultaneously helping the flowers reproduce by spreading their pollen. In contrast, an example of parasitism is seen in ticks that feed on the blood of mammals, benefiting from the host while causing harm.