In general, kung fu/kungfu (/ˌkʌŋˈfuː/ or /ˌkʊŋˈfuː/; pinyin: gōngfu pronounced [kʊ́ŋfu]) refers to the Chinese martial arts also called wushu and quanfa. In China, it refers to any study, learning, or practice that requires patience, energy, and time to complete. In its original meaning, kung fu can refer to any discipline or skill achieved through hard work and practice, not necessarily martial arts (for example, the discipline of tea making is called the Gongfu tea ceremony). The Chinese literal equivalent of "Chinese martial art" would be 中國武術 zhōngguó wǔshù.
There are many different styles of Chinese martial arts and Kung Fu has been adopted as an umbrella term for all of these forms, some ancient and some more modern. It’s a popular style of martial art that has gained notoriety through film and television, where some famous practitioners include Jackie Chan, Bruce Lee and Jet Li.