According to Wikipedia, Agnosticism is the philosophical view that certain metaphysical claims – such as the existence of God or the supernatural – are unknown and perhaps unknowable.
Whereas, Atheism is, in the broadest sense, the absence of belief in the existence of deities. Less broadly, atheism is the rejection of belief that any deities exist. In an even narrower sense, atheism is specifically the position that there are no deities. Atheism is contrasted with theism, which, in its most general form, is the belief that at least one deity exists.
This short video gives an interesting account on the difference between agnosticism and atheism; a matter which is confused by so many people, even the educated.
Join us to see for yourself how these two related terms can be differentiated.