The full form of OK is Olla Kalla, used to indicate agreement, acceptance, acknowledgment, or approval. Also spelled as OKAY, OKK the word OK comes from Greek which means all right. When we agree with someone, the word we usually say is okay, even used in texts.
Universality believes that OK is formed because of incorrect pronunciation. But the term OK has significantly become famous all over the world. Though the English language is the most spoken language in the whole world, and OK is an English term, hence, the full form of OK is the most used globally.
The term OK is about 180 years old as per some historical views and originated in America in the 19th century.
It was customary to use any work as a satire in the 19th century, so people believe that the formation of OK was because of wrong pronunciation. But, it was formed as a joke or satire.
The word “OK” was first used as a joke in the office of Charles Gordon Green in 1839. Then, he edited an article in the Boston Morning Post on March 23, 1839, with the word OK and added the full form, Oll Korrect.