The word error has a broad range of meanings in our daily lives and a specific connotation in science. In too many cases, the word is misinterpreted to mean the natural uncertainty in experimental measurements. Physics begins with measurement.
Every measurement has a degree of uncertainty associated with it.
Such deviations are called systematic. Therefore, any set of measurements exhibits a spread or range of values. These deviations are called random. We will seldom deal with systematic uncertainties. However, we must consider carefully in all measurements certain estimates of the uncertainty interval.