* The term ?kung fu? (aka Gongfu) is often taken to refer to ?Chinese Martial Arts?. In some cases (far too many) you?ll see places talking about ?kung fu and Tai Chi? as though ?kung fu? specifically means all Chinese martial arts except Tai Chi Chuan. This is nothing more, really, than a compounding of errors.
The hanzi (Chinese characters) read as ?kung fu? translate directly as ?skill time?.
The most appropriate translation for the term really becomes ?a high level of skill developed over a long time?. This is by no means a term exlusively relating to the martial arts, Chinese or otherwise. You can have kung fu in hairdressing, cooking, painting, writing, or any other area of endeavour that requires developed skill. It just happens that martial arts cinema has resulted in most people only recognising the term as referring to the fighting arts of China. Shaw Bros. and Golden Harvest had a large impact here.
The more correct term (in Mandarin) for ?martial arts? is in fact ?wu shu?. There have been a number of other terms used at various times to refer to the martial arts, but wu shu means ?martial arts?. The difficulty arises here in that the term has been adopted to refer most often to the performance/demonstration-based methods seen at many modern competitions. This group of activities exists as it does today because of the Chinese government?s influence, an interference often blamed for ?the death of real Wu Shu in China?.
Quite aside from that, there are and have been a tremendous number of systems of martial arts training extant in China. Someone saying ?I train in kung fu? or even ?I train in wu shu? is being, at best, vague. At worst, they?re missing some crucial information.
Even when you get more specific, it is often not specific enough to identify a particular system. Tai Chi Chuan (Taijiquan, or Supreme Ultimate Fist) is a name that can refer to several different systems. There are Yang style, Chen style, Wu style, Wang style, and several others. Whilst they all ultimately spring from the same root, they are very much individual systems. Tai Chi might be the most obvious example of this phenomenon, but there are many others. Preying Mantis could mean any of at least four systems, all different to each other. Even Choy Lay Fut has two very distinct branches (Bak Sing and Hung Sing).
Kung fu, or wu shu, as definite terms, don?t really serve very well. And this phenomenon is by no means restricted to the Chinese systems.