Mushrooms are fleshy, spore-bearing structures produced by fungi. There are over 1.5 million mushroom species worldwide, with around 80,000-88,000 identified. Mushrooms are classified based on their taxonomic position, natural habitat, and edibility for human consumption. Common edible cultivated mushrooms include oyster mushrooms, button mushrooms, paddy straw mushrooms, milky mushrooms, and shiitake mushrooms. Toxic and poisonous mushrooms like death cap and destroying angel mushrooms contain dangerous toxins and should not be consumed.