Agnosticism is a philosophical or theological position that holds that the existence of God or any deity is unknown or unknowable. An agnostic person is someone who neither believes nor disbelieves in the existence of God or any deity, and considers the existence of such entities as ultimately unknowable.

The term "agnostic" was first coined by the 19th-century biologist and philosopher Thomas Henry Huxley, who used it to describe his own position on the existence of God. Agnostics generally believe that there is insufficient evidence to support either theism (belief in a god or gods) or atheism (lack of belief in a god or gods). They may also reject the idea that human beings are capable of fully understanding or knowing the nature of the divine.

It's important to note that agnosticism is not the same as atheism, which is a belief that there is no god or gods, or theism, which is a belief in a god or gods. Agnosticism is a position on knowledge and certainty, rather than a belief or non-belief in a particular deity.