The term “protected areas” is sometimes used in a broad sense or may have a more specific meaning, which varies from country to country or even from region to region.
The International Union for Conservation of Nature (IUCN), an international authority on the status of nature and natural resources and the measures needed to safeguard them, groups protected areas into six categories according to their characteristics (size, location, etc.), and management approaches and objectives (research, protection, recreation, etc.). All categories are important, but they involve varying degrees of human intervention.