Measurement error refers to the discrepancy between an observed value and its true or correct value. It occurs when a measuring instrument, method, or individual fails to accurately measure something, resulting in an incorrect reading. This can be due to various factors such as human error, limitations of the measurement tool, or environmental conditions that affect the accuracy of the measurement. Measurement errors can have significant consequences, particularly in scientific research and quality control processes where accurate measurements are critical for making informed decisions and evaluating performance. To minimize measurement errors, it is essential to use appropriate instruments, calibrate them regularly, and follow standardized procedures when taking measurements.