Table of Contents
1 - About
Distance is a numerical description of how far apart objects are.
In most cases, “distance from A to B” is interchangeable with “distance between B and A”.
2 - Articles Related
3 - Definition
3.1 - Physics
In physics or everyday usage, distance may refer to a physical length, or an estimation based on other criteria (e.g. “two counties over”).
3.2 - Mathematics
In mathematics, a distance function or metric is a generalization of the concept of physical distance. A metric is a function that behaves according to a specific set of rules, and is a concrete way of describing what it means for elements of some space to be “close to” or “far away from” each other.
See also Data Mining - Similarity