This Variance Calculator allows users to compute either the population or sample variance of a dataset. It accepts numbers separated by commas, spaces, or new lines. When the user clicks “Calculate,” the script first computes the mean, then finds the squared difference of each number from the mean. It sums these squared differences and divides by either n (for population variance) or (n − 1) (for sample variance). The result is displayed along with each step, including the dataset, mean, squared differences, and total variance.