In binary, the digit 1 is the highest digit in the system (consisting of 0 and 1).
In a boolean machine language, a 1 is interpreted as "true".
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Yes.
1 is a single digit, 0 is the absence of a digit.
four
The binary number 1111 is 15. The digits in a binary number are exponents of 2 rather than 10, so that for a four digit number in binary, the digit places represent 8, 4, 2, 1 instead of increasing values of 10. 1111 = 8+4+2+1 = 15
That is called a "bit", short for "binary digit".