Silence is a relative or total lack of audible sound you can not hear a thing it is quiet.
Silence in social interaction is the absence of speech. Silence in this arena can be divided into three categories (Bruneau, 1973): mental, social, or both. These are defined according to time, context, and perception.
Physiologically, silence is the result of hesitation, stutters, self-correction, or the deliberate slowing of speech for the purpose of clarification or processing of ideas. These are short silences.
Interactive silence occurs in interactive roles, reactive tokens, or turn-taking.
According to cultural norms, silence can be interpreted as positive or negative. For example, in a Christian Methodist faith organization silence and reflection during the sermons might be appreciated by the congregation, while in a Southern Baptist church, silence might mean disagreement with what is being taught, or perhaps disconnectedness from the congregated community.
Placing the index finger in front of closed lips is the most widely recognized gesture of silence. The gesture can be used to demand silence without raising one's own voice. The rose, sometimes depicted clasped by or on top of closed lips, is another well-recognized symbol of silence stemming from various mythologies.
In the Western cultures, it is sometimes difficult to interpret the message being sent by a person being silent (i.e. not speaking). It can mean anger, hostility, disinterest, or any number of other emotions. Because of this, people in Western cultures feel uneasy when one party is silent and will usually try their best to fill up the silence with small talk.
The Western Apaches use silence during times of uncertainty or anger in the way most people in Western cultures would be vocal. The goal is to observe and anticipate what the other party is going to do.
Music inherently depends on silence in some form or another to distinguish other periods of sound and allow dynamics, melodies and rhythms to have greater impact. For example, most music scores feature "rests" denoting periods of silence.
Some composers take the use of silence in music to an extreme. 4′33″ is an experimental musical work by avant-garde composer John Cage. It consists of just over four and a half minutes of silence. Though first performed on the piano, the piece was composed for any instrument or instruments and is structured in three movements. The length of each movement is not fixed by the composer, nor is the total length of the piece. The title of the piece should reflect the timings chosen, and could therefore be different at every performance. The modern performance tradition of 4′33″ is to keep the total duration fixed as at the first performance.
An argument from silence (Latin: argumentum ex silentio) is an argument based on the assumption that someone's silence on a matter suggests ("proves" when a logical fallacy) that person's ignorance of the matter. In general, ex silentio refers to the claim that the absence of something demonstrates the proof of a proposition.
In labs, animals that have been subject to a total lack of noise have shown signs of behavioral changes and aggression (see Sensory deprivation).
The musician and composer, Antony Pitts, remarked that true absolute silence is virtually unattainable, and noted that the silence people usually speak of is normally what we think of as simple quiet.