Unit conversion is the process of changing a measurement from one unit to another. This is often necessary when different systems of measurement are used, such as converting from meters to feet or from liters to gallons. Understanding how to convert units helps ensure accurate communication and calculations in various fields, including science, engineering, and everyday life. To perform a unit conversion, you typically use a conversion factor, which is a ratio that expresses how many of one unit are equal to another. For example, to convert inches to centimeters, you would multiply the number of inches by the conversion factor of 2.54, since one inch is equal to 2.54 centimeters.