Renewable resources are natural resources that can be replenished or regenerated at a rate comparable to or faster than the rate at which they are being used. Examples include sunlight, wind, and biomass. Non-renewable resources, on the other hand, are finite and cannot be replenished within a human's lifespan. Examples include fossil fuels like coal, oil, and natural gas. The key difference is that renewable resources can be sustained indefinitely, while non-renewable resources will eventually run out.