Aikido is a modern martial art founded in early 1940s by Morehei Ueshiba mostly regarded as 'O Sensei' meaning the Great Teacher. 'O Sensei' combined the traditional Samurai styles of warrior techniques, Budo, Bushido disciplines which he learnt from traditional Jujutsu schools and collectively termed it as Aiki-Budo. (An early form of Aikido). Post world war-II incidents and spiritual awakening of 'O Sensei' changed the methods of performing the techniques, while concentrating more on inner energy thus infusing an approach with Ki, hence became Aikido. The way of harmony with inner/cosmic energy.