What is what?

Kung-fu
Chinese martial art.
The term was originally used in the sense of “excellent” or “well accomplished” (literally meaning roughly “achievement attained through work”), so it did not only refer to martial arts, but to anything carried out masterfully. In the 1960s, thanks to Hong Kong action films, its meaning as “Chinese martial art” became widespread. In Hong Kong and Taiwan, this term is generally used for classical Chinese martial arts.

Qigong
Breathing exercise, energy exercise.

Wushu
Chinese martial art.
A modern term, it began to be used in the People’s Republic of China in the 1960s. Wu means “combat, martial,” and Shu means “art.” Initially, it mainly referred to the newer (more sport-oriented) styles of the People’s Republic. Today, classical systems have also become popular again in China, and they too use the widely adopted term Wushu. Many people still understand it as the modernized, spectacular, acrobatic systems of the People’s Republic, and distinguish it from traditional styles.