What is the Cosmological argument?

The cosmological argument is effectively an argument that states the very existence of the universe is strong evidence for the existence of God. This argument is 'a posteriori' (meaning that it is an argument based off of experience - the experience that the world exists) and its name originates from the Greek words 'cosmos' (universe) and 'logos' (rational discourse,) and this information is useful to include in your introduction when answering a question about the cosmological argument. There are several forms of the argument which vary in complexity, however the most simple and common form of the argument is known as the 'Kalam' cosmological argument.The Kalam cosmological argument itself can be summarised into the following premises and conclusion: 1 - Everything that exists has a cause of its existence. 2 - The universe exists. 3 - The universe must therefore have a cause and this cause is God