Rain is water that falls down to Earth's surface from clouds.

Rain is water that falls down to the Earth from clouds. Clouds are formed when the Sun heats up the surface of a lake or a sea. When this happens, the water begins to evaporate and rise up, forming clouds. When the water vapor becomes condensed in the upper atmosphere, it forms small droplets that begin to fall towards the ground. 

Normal rain can be either heavy or light. Usually, the raindrops are of a normal size, and the rain can continue for several hours without stopping.

Drizzle rain consists of rain drops that are so small that they do not even cause ripples when they hit the surface of ponds or lakes. However, drizzle rain is still wet, and it can also prevent visibility. 

Rain shower is a type of rain that comes in short, heavy spurts. The raindrops are often large, and a large amount of water falls down in a short period of time. If the rain shower is connected to a thunderstorm, we are talking about a lighting shower. 

Sleet showers are rain showers where water falls down in the form of small pieces of ice called sleet. They can occur in the summer, especially during lightning showers.