Cloaking device

A cloaking device, also known as a cloaking system, cloaking shield or invisibility screen in Star Trek, was a form of stealth technology using a warp drive to warp space so that incident light rays bend around an object instead of being reflected from it. This renders a starship or other object completely invisible to the electromagnetic spectrum and most sensors, except for those that detect "warp core signatures". It was encountered in varying forms over the centuries. The Federation often encountered Klingons and Romulans with the technology, until they adopted its use from around 2370.