Once again, much of the information you need to know about this weapon is contained in the name. There's more to this torpedo than just being light, though - it's also incredibly agile. Once fired, the torpedo can duck and dive through enemy fire, avoiding anti-missile weapons and slamming into enemy submarines.
It was developed as a response to the introduction of modern, fast-moving submarines by hostile nations, and can be launched from the air, or by ships on the surface.