A drought is part of the climate and happens when there is less rainfall than is expected over an extended period of time for a region.
More formally a drought is a deficiency of rainfall over a period of time, resulting in a water shortage needed for basic needs, drinking, and agriculture, and to sustain the current environment. It impacts wildlands such as forests and grasslands and aquifers (groundwater) and surface water supplies.
What is considered a drought depends on the area and the typical climate of the region. A drought can last for months or years, or may be declared after as few as 15 days.
Drought can strongly affect our lives because water is such an important part our daily activities. We need water to grow the food we eat, for drinking, bathing and cleaning. When we don't have enough water for these activities because of a drought people will be affected.