A habitat is a more permanent ecosystem that has stabilized and reached dynamic equilibrium.  The types of living organisms in a habitat are likely to remain there in the future, and the habitat will probably maintain some degree of constancy.

Groups of species living in a unique environment constitute a habitat.  Habitats are classified based on their physical and chemical properties, inhabitants, and other features.

The environment may be classified based on its topography, soil, temperature, rainfall, moisture, and many other physical characteristics. 

Chemical properties, such as level of acidity, types of nutrients and pollutants present, and oxidation reduction status, also help to identify individual habitats.

The living organisms found within a habitat also help to define it.  Occasionally, those habitats with treed areas (forests) are classified as one group, while areas that instead have grasses (prairies) are grouped separately.

Most major types of habitats have many unique subtypes.  In forests, for example, different types of soil often lead to entirely different habitats.