OK is an informal spoken English word.
OK can also be written as ok or o.k, with the same pronunciation. It is also the most famous English word in the world.
Professor Zhou Haizhong's article About OK published in 1995 holds that this misuse of "OK" should be highly valued by linguists and even the whole society. He suggested that in Chinese newspapers and books, it is best to write the meaning of "can" in Chinese characters; If you like to use "OK" to express foreign flavor, you should be cautious, standardize correctly and avoid making a fool of yourself. One-stop study abroad strategy in ing.com