Wetlands are unique environments in which the soil is saturated with water for all or most of the year. Often, wetlands include pools of standing water for much of the year, and all wetlands host a multitude of plant and animal species that have adapted to their unique conditions. Wetlands are an extremely valuable natural resource: in addition to offering habitat for plants and animals, they also help protect neighboring land, and reduce soil erosion. For this reason, many countries around the world have embarked on wetlands conservation programs, so that wetlands will be around for future generations.

There are several types of wetlands, depending on where they are located and the chemical makeup of the water in them. In most cases, wetlands form a intermediate area between a large body of water such as an ocean or lake and dry land, although some inland wetlands form in areas isolated from bodies of water. Wetlands tend to form in areas of low ground, which accumulates water readily, and if allowed to thrive without disruption, they have numerous positive affects on the natural environment.

When asked to visualize wetlands, most people think of marshes. Marshes are characterized by low growing plants and reeds and a sense of open space: coastal marshes are salty, thanks to the salt water which floods them. Other types of wetland include bogs, which have a highly acidic chemical balance, and fens, which are very alkaline. Swamps are wetlands which support trees and other large plants, often with limited visibility, and due to their soil saturation and pools of standing water, they are classified as wetlands.

One of the most important functions of a wetland is to act as a buffer zone between a body of water and dry land. Wetlands protect land from flooding and storm damage by absorbing the brunt of it. In addition, wetlands help to prevent soil erosion, because the plants and trees that live in them form dense networks of roots that hold the soil in, preventing it from washing away. Many wetlands actually create accumulations of rich, nutritious soil upon which plants, animals, and birds can thrive.

Wetlands provide habitat for numerous animals including dragonflies, crayfish, catfish, sculpins, snakes, turtles, geese, herons, frogs, flamingos, and many others. Most of these animals have adapted specifically to living in wetlands. Long legged birds, for example, use their long legs to keep their torsos out of the water, and have long necks and beaks to reach into the water for food such as aquatic plants and insects. Loss of habitat for wetlands animals could be devastating, as they are ideally suited to life in wetlands conditions, and many of them would face dangerous predators and unfavorable living conditions outside of wetland areas. In addition, wetlands play host to numerous plants, not all of which have been categorized and studied.