What is a number line?

A number line gives a visual depiction of numbers that aids in understanding concepts such as absolute value, inequality, and relative magnitude. It is a common mathematical technique for representing and comparing numbers, and it can be handy when working with negative or fractional numbers.
Using a number line can make it easier to visualize and solve issues involving arithmetic operations like addition, subtraction, multiplication, and division. It can also aid in comprehending addition, subtraction, distance, rate, and slope concepts.
A number line, in general, is a valuable tool for assisting people in understanding and working with numbers.