A "Field Guide" is a book designed to help readers identify and understand various elements of the natural world, such as plants, animals, and geological features. These guides often include illustrations or photographs, descriptions, and information about habitats, behaviors, and characteristics. They are commonly used by hikers, birdwatchers, and nature enthusiasts. Field guides are typically organized by categories, making it easier for users to find specific species or objects. They may focus on particular regions, like the Appalachian Mountains or Amazon Rainforest, and can cover topics such as birds, wildflowers, or insects.