Rounding Error
/ˈraʊn-dɪŋ ˈer-ər/
noun — “the tiny mismatch between what a number is, and what a computer can afford to remember.”
Rounding error is the difference between an exact mathematical value and its finite approximation when represented in a digital system. It appears whenever a number must be shortened, simplified, or forced into a format that cannot store infinite precision, especially in floating-point arithmetic.