A Renewable resource is a naturally-occurring resource from the Earth that can replenish itself or grow back again, such as sun, water, trees, and animals.

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Other /More definition:
Renewable resource is the resource that can be replenished rapidly (hours to several decades) through natural processes. Examples include trees in forests, grasses in grasslands, wild animals, fresh surface water in lakes and streams, most groundwater, fresh air, and fertile soil. If such a resource is used faster than it is replenished, it can be depleted and converted into a nonrenewable resource. Compare nonrenewable resource and perpetual resource. See also environmental degradation.