Occam's razor (also Ockham's razor or Ocham's razor) is the problem-solving principle that states "entities should not be multiplied unnecessarily".

奧卡姆剃刀原理（Occam's razor）是由14世紀(jì)英格蘭的邏輯學(xué)家、方濟(jì)會（Franciscan，有機(jī)會我們來介紹介紹這個）修士奧卡姆的威廉（William of Occam，約1285年至1349年）提出。這個原理稱為“如無必要，勿增實(shí)體”，即“簡單有效原理”。正如他在《箴言書注》2卷15題說“切勿浪費(fèi)較多東西去做，用較少的東西，同樣可以做好的事情?！?br>

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The idea is attributed to English Franciscan friar William of Ockham (c. 1287–1347), a scholastic philosopher and theologian.

It is sometimes misrepresented in pop culture and other media by some form of the statement "when presented with two competing ideas, the simpler one is more likely to be correct" . This is not a form of Occam's razor, but instead is known as the law of parsimony or the law of simplicity.

Occam's Razor instead is saying that when presented with competing hypotheses that make the same predictions, one should select the solution with the?fewest assumptions?and is not meant to filter out hypotheses that make different predictions.