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Godwin's Law (also known as Godwin's Rule of Nazi Analogies) is a humorous observation coined by Mike Godwin in 1990, and which has become an Internet adage. It states: "As a Usenet discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches 1."
Godwin's Law is often cited in online discussions as a deterrent against the use of arguments in the widespread reductio ad Hitlerum form. The rule does not make any statement about whether any particular reference or comparison to Adolf Hitler or the Nazis might be appropriate, but only asserts that the likelihood of such a reference or comparison arising increases as the discussion progresses. It is precisely because such a comparison or reference may sometimes be appropriate, Godwin has argued, that overuse of Nazi and Hitler comparisons should be avoided, because it robs the valid comparisons of their impact.
There are many corollaries to Godwin's law, some considered more canonical (by being adopted by Godwin himself) than others invented later. For example, there is a tradition in many newsgroups and other Internet discussion forums that once such a comparison is made, the thread is finished and whoever mentioned the Nazis has automatically "lost" whatever debate was in progress.