The number "−2" is a negative integer that represents a value two units less than zero. In mathematics, negative numbers are used to indicate values below zero, often in contexts such as temperature, debt, or elevation below sea level. In the number line, "−2" is located to the left of zero, showing that it is less than zero. It is part of the set of integers, which includes positive numbers, negative numbers, and zero. Understanding negative numbers like "−2" is essential for various mathematical operations and real-world applications.