The dewpoint is essentially an absolute measurement of the amount of water in the air. The dewpoint indicates the temperature at which your current RH and temperature values will exceed 100% RH and condense out of the air. The further the dewpoint is from the current temperature, the less likely condensation will occur. At 100% humidity, the current temperature and the dewpoint will be the same.

Ex: At a temperature of 80F and 50% RH, the dewpoint is 60F. This means that at 60F, the same amount of water in the air would reach 100% humidity and will condense.