This document defines integers and discusses their properties and real-world applications. Integers include whole numbers and their opposites, such as 6 and -6. Negative numbers are used to represent temperatures below zero, locations below sea level, and amounts of debt. The absolute value of a number represents its distance from zero on the number line. Opposite numbers are integers that are the same distance from zero but in opposite directions. Distance between integers can be found by subtracting their absolute values if they are on the same side of zero, and adding if they are on opposite sides.