Rain, sleet, snow, and hail are all forms of precipitation. Precipitation usually supplies most of the water needed by living things. This water collects in many different places. A large amount of it becomes part of the soil. The runoff water forms streams, ponds, lakes, and rivers.
Humidity is another form of moisture.
It is the water vapor in the air. When you watch TV the weather person usually gives the temperature and then the relative humidity . When it is raining or snowing the relative humidity is usually 100. This means the air holds all the water vapor it can hold at the given temperature. The water vapor comes from large bodies of water such as oceans, seas, or lakes.