What is dew point?

Dew point is the temperature at which air becomes saturated with water vapor, leading to the formation of dew, fog, or clouds. It is the point at which the air is holding as much moisture as it can at a particular temperature, so any additional moisture will condense into liquid form. The dew point is often used to measure atmospheric moisture or humidity, as it provides a better measure of the amount of water vapor in the air than relative humidity.