According to yourDictionary.com, “ok” is the most popular word on the planet. Its origin:
“OK” originated in a joke in the 1830’s, spelled “oll korrekt” in Boston newspapers, the joke being, both words were incorrect. It became so popular, that it was soon abbreviated to simply “O. K.” Despite its popularity, the word would have fallen by the wayside had not Martin van Buren, called “Old Kinderhook” for being born in Kinderhook, N.Y. used it in his presidential reelection campaign of 1840.
The more you know!