Occam's razor is a problem-solving principle that states that among competing hypothetical answers, the one that makes the least number of assumptions should be selected. In other words simpler solutions are more likely to be correct than complex ones. If an element can be discarded without losing its meaning, then it must be removed.
The Principle is named after William of Ockham (circa 1287–1347), an English Franciscan friar, philosopher and theologian during the Medieval period. Occam himself wrote: "Plurality must never be posited without necessity". Since then, this principle has been applied in a number of fields, including science, biology, medicine, probability theory, and statistics.