What does the absolute value of a number represent?

The absolute value of a number is defined as its distance from zero on the number line, regardless of direction. This is why the correct answer focuses on the concept of distance. The absolute value of both positive and negative numbers is always a non-negative value, as it reflects how far a number is from zero without considering its sign.

For example, the absolute value of -3 is 3, and the absolute value of 3 is also 3, illustrating that both numbers are equidistant from zero. This concept is fundamental in mathematics, especially in understanding inequalities, distances in geometry, and more.

The other options do not accurately capture the essence of what absolute value represents. The midpoint, the distance between endpoints, and the value's position on the number line involve different mathematical concepts that do not pertain specifically to the definition of absolute value. Absolute value solely focuses on the measure of distance from zero, making option B the one that accurately reflects its meaning.