A ratio scale is a type of measurement scale that has a true zero point, allowing for the comparison of absolute magnitudes. This means that not only can you measure differences between values, but you can also make meaningful statements about how many times one value is greater than another. Examples of ratio scales include measurements like height, weight, and temperature in Kelvin. In a ratio scale, both addition and multiplication are applicable, making it versatile for various statistical analyses. Common applications include fields such as science, economics, and psychology, where precise measurements are crucial for data interpretation and decision-making.