Parasitizing refers to the act of a parasite living on or within a host organism and deriving nutrients and other resources from it, often at the expense of the host's health and well-being. The parasite benefits from this relationship, while the host may suffer negative consequences such as weakened immune function, reduced growth or reproduction, and even death. Parasites can range from tiny microbes to larger organisms such as ticks, lice, fleas, and worms, and can infect a wide variety of animals, including humans. Parasitism is a common ecological relationship, and understanding it is important in fields such as medicine, agriculture, and conservation.