A real number is any value that can be found on the number line. This includes all the rational numbers, like fractions and whole numbers, as well as irrational numbers, which cannot be expressed as simple fractions, such as π and the square root of 2. Real numbers can be positive, negative, or zero, making them essential for various mathematical calculations. Real numbers are used in everyday life, from measuring distances to calculating money. They help us understand quantities and relationships in the world around us. Whether you're adding, subtracting, multiplying, or dividing, real numbers are the foundation of basic arithmetic and advanced mathematics.