       Ontology is one of the most ancient and the study comes from the Greek, which means it is in science and doctrine. The term ontology can also mean science which deals with the nature that exist, such as the fact no boundaries, physical and spiritual, and abstract. In a simple ontology can be defined as the study of concrete reality or reality critically.
      In the view of ontology there are some views - sight of the mind, such as:
~Monism
      Monism outlook assumes that the essence comes from the fact that it is only one, namely as the source of the material and spiritual. Thoma Davidson said monism is a block universe. Monism has two streams, namely:
         Materialism: The flow that considers the source of everything that really exists is matter and spirit is spirit. More details are something we are doing is not ourselves. We only deceive ourselves for the sake of a better life.
             Example: People make friends with the rich friends.
         Idealism: This stream has the sense of something that is present in the soul. This flow assumes that a real essence of it comes from the soul or something that is not formed his form. So this view emphasize the things are ideas, and degrading things that matter and physical. Idealism emphasizes sense as the former more than the material.
             Example: A universe was just an idea. The idea that made us think that its something that exists in the universe is different from what we think.
 ~Dualism
      The views dualism is the teaching which states that reality is composed of two different substances and contradictory. Each substance is unique and can not be reduced, for example, the substance of the supernatural with the natural, God and the universe, spirit and matter. There are also saying that dualism is the teaching that combines idealism and materialism, saying that this universe consists of two nature as the source of which is the nature of the material and the spiritual.
 ~Pluralism
