A Faraday cage is specifically designed to block external static and non-static electric fields by channeling electricity throughout the cage's conducting material, thus protecting the contents inside from electric charges and electromagnetic radiation. It is used in secure facilities to prevent electronic eavesdropping and unintended RF communication. Tempest shielding, while related to blocking external signals, is more about mitigating emanations from electronic equipment rather than creating a physical barrier. On the other hand, a soundproof room and a reinforced concrete wall may provide certain levels of protection against eavesdropping and RF signals, but neither is specifically designed to prevent RF signal leakage like a Faraday cage.