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Binary number
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<p>A binary number is a <a href="/facts/Number/auQSAE2m">number</a> expressed in the <a href="/facts/Radix/J5RGWRJF">base</a>-2 <a href="/facts/Numeral_system/1KKlG4nd">numeral system</a> or binary numeral system, a method for representing <a href="/facts/Number/auQSAE2m">numbers</a> that uses only two symbols for the <a href="/facts/Natural_number/u65og8JE">natural numbers</a>: typically "0" (<a href="/facts/Zero/Cxg56PNn">zero</a>) and "1" (<a href="/facts/One/hKwzfr3g">one</a>). A <i>binary number</i> may also refer to a <a href="/facts/Rational_number/VJQmyY05">rational number</a> that has a finite representation in the binary numeral system, that is, the quotient of an <a href="/facts/Integer/PUwwrawx">integer</a> by a power of two. </p><p>The base-2 numeral system is a <a href="/facts/Positional_notation/31DECoN4">positional notation</a> with a <a href="/facts/Radix/J5RGWRJF">radix</a> of <a href="/facts/2/u5WC44t9">2</a>. Each digit is referred to as a <a href="/facts/Bit/RwfjaYSv">bit</a>, or binary digit. Because of its straightforward implementation in <a href="/facts/Digital_electronic_circuit/3kJcKbkw">digital electronic circuitry</a> using <a href="/facts/Logic_gate/RHLulvKI">logic gates</a>, the binary system is used by almost all modern <a href="/facts/Computer/SQe1aK05">computers and computer-based devices</a>, as a preferred system of use, over various other human techniques of communication, because of the simplicity of the language and the noise immunity in physical implementation. </p> <table><tbody><tr><th scope="col"> Decimalnumber</th><th scope="col"> Binarynumber</th></tr><tr><td> 0</td><td> 0</td></tr><tr><td> 1</td><td> 1</td></tr><tr><td> 2</td><td> 10</td></tr><tr><td> 3</td><td> 11</td></tr><tr><td> 4</td><td> 100</td></tr><tr><td> 5</td><td> 101</td></tr><tr><td> 6</td><td> 110</td></tr><tr><td> 7</td><td> 111</td></tr><tr><td> 8</td><td> 1000</td></tr><tr><td> 9</td><td> 1001</td></tr><tr><td> 10</td><td> 1010</td></tr><tr><td> 11</td><td> 1011</td></tr><tr><td> 12</td><td> 1100</td></tr><tr><td> 13</td><td> 1101</td></tr><tr><td> 14</td><td> 1110</td></tr><tr><td> 15</td><td> 1111</td></tr></tbody></table>