Simplest

Simplicity is the state or quality of being simple. Something which is easy to understand or explain seems simple, in contrast to something complicated. Alternatively, as Herbert A. Simon suggests, something is simple or complex depending on the way we choose to describe it. In some uses, the label "simplicity" can imply beauty, purity, or clarity. "Simplicity" may also occur with negative connotations to suggest a deficit or insufficiency of nuance or of complexity of a thing, relative to what one supposes as required.

The concept of simplicity has been related to in the field of epistemology. According to Occam's razor, all other things being equal, the simplest theory is the most likely to be true. In the context of human lifestyle, simplicity can denote freedom from hardship, effort or confusion. Specifically, it can refer to a simple living style.

Simplicity is a theme in the Christian religion. According to St. Thomas Aquinas, God is infinitely simple. The Roman Catholic and Anglican religious orders of Franciscans also strive after personal simplicity. Members of the Religious Society of Friends (Quakers) practice the Testimony of Simplicity, which involves the simplifying of one's life in order to focus on things that are most important and disregarding or avoiding things seen as least important.

In the philosophy of science, simplicity is a meta-scientific criterion by which scientists evaluate competing theories. In this field, a distinction is often made between two senses of simplicity: syntactic simplicity (the number and complexity of hypotheses), and ontological simplicity (the number and complexity of things postulated). These two aspects of simplicity are often referred to as elegance and parsimony respectively.

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