A number line graph is a visual representation of numbers arranged in a straight line. It typically includes evenly spaced intervals, allowing for easy identification of values. Each point on the line corresponds to a specific number, making it useful for illustrating relationships between numbers, such as addition and subtraction. Number line graphs can also represent negative and positive values, extending in both directions from a central point, often labeled as zero. They are commonly used in mathematics education to help students understand concepts like integers, fractions, and decimals, as well as to solve problems involving absolute value and inequalities.