The full form of OK is Olla Kalla, a Greek term meaning "All Correct." The term was initially used as an abbreviation for "oll korrect," a popular slang misspelling of "all correct."
This abbreviation gained popularity in the 19th century, particularly in American newspapers, and eventually became a common expression in English.
Today, "OK" is used as a general affirmation, meaning "yes," "alright," or "agreed." It is also used as an adjective meaning "adequate" or "acceptable."
