What does rainwater mean?

Rainwater is water that falls directly from the sky as precipitation. It can be used to fill reservoirs, to irrigate crops, or for drinking water. Rainwater is typically acidic and contains various pollutants, such as dirt, bacteria, and chemicals. It is important to treat rainwater before drinking or using it for other purposes. Rainwater harvesting is the process of collecting and storing rainwater for later use. Rainwater harvesting can be used to reduce the demand for fresh water, to conserve water during droughts, and to improve water quality.