Patch. Cad is the computer version of Kantu King software, and cad is the Chinese format in cad. According to the query data of cad software official website, the English meaning of patch is patch, that is, something commonly used when mending clothes. Now it often refers to memory patch, file patch and so on. In the computer, it is also one of the computer command programs, which is widely used. Cad software is practical and easy to operate, and has been trusted by countless customers since it was launched.