Kingdom Fungi are eukaryotic organisms that lack chlorophyll and are not photosynthetic. They have cell walls made of chitin and absorb nutrients from external sources through filaments called hyphae that make up their mycelium. Recent evidence suggests fungi are more closely related to animals than plants or protists. While some fungi can harm humans and agriculture, many are also useful as they break down organic material, form mutualistic relationships with plants, and are used in industries like baking, brewing, and medicine production.