Significant figures are the digits in a number that carry meaning about its precision. In simple words, significant figures tell us how accurate a number is. For example, the number 25 has two significant figures, while 25.0 has three significant figures. That small zero makes a big difference because it shows extra accuracy. Many people struggle to understand which digits count as significant figures. Non-zero digits are always significant. Zeros between non-zero digits are also significant. But zeros at the beginning of a number may not be significant. This is where confusion starts. For example, 0.0025 has only two significant figures, even though it has four digits.. https://sigfig-calculator.us/