parasite

A parasite is an organism that lives on or inside another living thing and gets food from it without helping. This can be a tiny bug that sucks blood from an animal's skin.

When we talk about parasites, we usually think of animals like fleas on dogs or ticks on cats, but the word also applies to plants and even humans! For example, if someone is always borrowing money from their friends and never paying it back, you could say they're a "parasite" because they're taking advantage of others without giving anything in return. This meaning of parasite isn't just about animals or diseases; it's more like a social problem.