The Cosmological Argument, which is based on the general fact of the existence of the world,

The Teleological Argument, which is based on particular features of design in the world

And The Ontological Argument, which is based on reason alone.

The Ontological Argument is based on the very being of God. It is not based on any observations of the world, nor any form of experience or external knowledge. It attempts to prove the existence of God from the meaning of the word God. E.g. If you understand what God is, you understand that he must exist.

The Ontological Argument is also an "A priori" argument, meaning that it uses logic to prove that an initial definition is true.

The Ontological Argument (ontos meaning "being") is not one single argument. It is best referred to as a group of related arguments, argued by different philosophers such as, Anselm, Descartes, Malcolm and Plantinga.

As with any Argument or theory, there are criticisms as well, proposed by philosophers such as, Hume, Kant, Gaunilo and Russell.

The most well known form of the Ontological Argument was thought of by St Anselm of Canterb

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