On April 11, 1955 at a conference, most Korean martial arts masters decided to merge all the various fighting styles under the name "Tae Soo Do".
The main difference between karate/kungfu and Taekwondo is that in Taekwondo, use of legs in kicking is more emphasized. Taekwondo is famous for its spinning, kicking techniques. Hand strikes are also used, but they are not emphasized.
Three things in Taekwondo are-