Parasitism is an interaction between two species in which one
(known as parasite) obtains its food in ready-made form from the other
living organism (said to be host). Whereas, predation is a kind of
direct food relationship between two species of animals in which one,
called predator, captures and feeds on the other, the prey. In contrast
to a parasite which derives nourishment from its host without killing, a
predator is free-living which catches and kills another species
for food.