Final answer:
Significant digits, also called significant figures, represent the precision of a measurement by indicating the meaningful digits in a number.
Explanation:
Significant digits, also known as significant figures, are all the numerals in a measured quantity whose values are considered as known exactly, plus one more that could be one more or one less. They represent the meaningful digits in a number and indicate the precision of a measurement. Nonzero digits are always significant, while zeros may serve as placeholders or be considered significant depending on their position in the number.
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