A parasite is an organism that lives of another organism, often causing it harm.
They take what they need from that organism, and give it nothing but pain, discomfort or illness in return.
The organism being fed upon is called a host. So, the parasite lives of the host, takes what it came for, and leaves it harmed.
An example of a parasite is a tapeworm. These absorb large amounts of nutrients from the host, and cause it to be malnourished.
This can kill…