That is called a "bit", short for "binary digit".
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1 is a single digit, 0 is the absence of a digit.
34 (decimal) = 1 0 0 0 1 0
Binary code is a language used in computer programming and is made up entirely of ones (1) and zeroes (0).
Those are the digits used in binary - and it means the same as elsewhere: the digits one and zero.
1011 in binary code is 11 in 'ordinary' (decimal) code. In the table, the top row shows the value of each digit, which depends on its position. The row below that is our binary number. ----------------- | 8 | 4 | 2 | 1 | ----------------- | 1 | 0 | 1 | 1 | ----------------- So the value of 1011 is 8 + 0 + 2 + 1 = 11 See the related link, Binary Numbers, below.