‘What is agnosticism?’ examines where agnosticism sits in the spectrum of beliefs about God. What is agnosticism's response to the question ‘Does God exist?’ Clearly, ‘we don't know’ is not an answer, but rather an admission that one doesn't have an answer. There are important distinctions between different types of agnosticism, with ‘weak agnosticism’ stating that one doesn't know that God exists, and ‘strong agnosticism’ stating that one cannot know that God exists. ‘Evidential agnosticism’ corresponds to the position Richard Dawkins describes as Temporary Agnosticism in Practice. Its relevance to weak and strong agnosticism is examined.