This is Why Error and significant figures? Explanation?

What is error ?
Causes of error ?
Examples of error?
Absolute error?
Mean error?
Mean absolute error?
Relative error?
Fractional error?
Types of error?
Random error?
Systematic error?
Significant error?
Rules of significant figures?
Rules of Rounding off a number?
Importance rule of subtraction and addition?
Addition and subtraction of significant figures?

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