Warmer air can hold more water.
So if the temperature is 70 but the dew point is 50 it means that the temperature could cool to 50 degrees before there is condensation or fog , at 50 the humidity reaches 100% and if the air cools more it has to release the water in the form of rain or dew or rain.
In the end its just a way to say how muggy it is, the dew point will always be lower or equal to the current temp, The higher the dew point the more muggy it will feel
At lower temperatures high humidity might not be felt , if its 40 degrees out and 90% humanity it might not feel humid because its chilly
If its 100 degrees out and 90% humanity well its going to feel much more humid
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