RMS, or Root Mean Square, is a mathematical term used to describe the average value of a set of numbers. It is calculated by taking the square root of the sum of the squares of each number in the set, and is often used to measure the magnitude or intensity of a signal or data set. In simpler terms, RMS can be thought of as the “typical” or “effective” value of a set of numbers, taking into account both positive and negative values. It is commonly used in fields such as physics, engineering, and statistics to accurately represent the overall value of a data set.