The term iaijutsu (居合術) became prevalent later (ca. 15th century) term encompassing both the practice of drawing the sword and cutting (tameshigiri). Iaidō is often used interchangeably with Battōjutsu, literally meaning 'technique of drawing the sword'. Kenjutsu is generally practiced with a partner, in the form of predetermined routines, and often does include drawing or resheathing of the sword. Kendo is practiced with a partner in full contact training or in forms (kata) practice. The main weapon used in kendo, a flexible bamboo sword (shinai), uses no scabbard. Kendo teaching does not include drawing and re-sheathing of a sword. Iaidō should not be confused with kendo or kenjutsu: However, around a century before his birth, the dynamic art of iaijutsu had been developed by Iizasa Ienao, the founder of the Tenshin Shōden Katori Shintō-ryū. In the book Bugei Ryuha Daijiten by Watatani Kiyoshi and Yamada Tadashi, Hayashizaki Jinsuke (Minamoto no) Shigenobu is credited with establishing the influence and popularity of the art early in the sixteenth century that is today widely practised as iaidō.

The word iaidō approximately translates into English as 'the way of mental presence and immediate reaction.' 'Nothing remains intact once it comes in contact with a Samurai Sword., In the hands of a master a Samurai Sword can be an execution warrant for an oponent.' IAI - Isao Machii／Interview - IS JAPAN COOL? DOU （居合 - 町井勲）

We believe these introductional videos might help you better understand the concept of Iaido : NHK Sports Japan - Iaido Iaidō in North America is often taught in dojo that also teach Aikido or Kendo. Because of this non-competitve aspect, and iaidō's emphasis on precise, controlled, fluid motion, it is sometimes referred to as 'moving Zen.' Iaidō does not include direct competition or sparring of any kind.

Iaido stance anime