Iaidō is a Japanese martial art that emphasizes being aware and capable of quickly drawing the sword and responding to sudden attacks.
Iaido consists of four main components: the smooth, controlled movements of drawing the sword from its scabbard (or saya), striking or cutting an opponent, removing blood from the blade, and then replacing the sword in the scabbard.
While beginning practitioners of iaido may start learning with a wooden sword (bokken) depending on the teaching style of a particular instructor, most of the practitioners use the blunt edged sword, called iaitō. Few, more experienced, iaido practitioners use a sharp edged sword (shinken).
Practitioners of iaido are often referred to as iaidoka.
Here in the next video is everything you need to know if you are planning to start training iaido: