What is accuracy in measurement? Accuracy depends on which factors?

(N/A) Accuracy is a measure of how close a measured value is to the true or accepted value of the physical quantity.
It indicates the degree of agreement between the measured value and the actual value.
Accuracy depends on the following factors:
$1$. The precision of the measuring instrument (the resolution or least count).
$2$. The skill and technique of the observer.
$3$. The presence of systematic errors in the measurement process.
$4$. The environmental conditions under which the measurement is performed.