A Rainforest is a large area of nature, filled with lots of tall trees. Rainforests have lots of rain, hence the name rainforest, which means it's normally sticky and humid in the rainforest. Rainforests are one of earth's oldest and most majestic living beings on earth. There are many layers in a rainforest, including The Emergent Layer, The Canopy Layer, The Understory Layer and the Forest Floor.