Moisture can be both a liquid and a gas. A gas, such as steam, is wet if you touch it. Moisture is more commonly though of as a liquid, however. Water is a liquid, and a moisture, Steam is a gas, and a moisture.
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Rain is a liquid, not a gas. If rain was a gas, you would be barely able to see it. Rain as gas is an example of a cloud, and you can't 'touch' a gas. You can touch a liquid, and you know rain is a liquid only when it expands on an object. Rain as an object would be 'ice'.
When liquid water falls from the sky, it is called rain.
Rain on Titan is believed to be composed of liquid methane or ethane due to the frigid conditions on the surface of the moon. These hydrocarbons condense into clouds in Titan's thick atmosphere and eventually rain down onto the surface in liquid form.
Rain and drizzle are in liquid form, whereas snow, sleet, and hail are in solid form.
If you are referring to a tropical rain forest, you won't find ice so that leaves liquid and vapor. There are temperate rain forests where you can find solid, (snow & ice) liquid and vapor.
The process is called condensation. In this process, water vapor cools down and transforms into liquid water droplets, eventually forming rain.