vs
QUICK ANSWER
"Si" is a form of "si", a conjunction which is often translated as "if". "OK" is an interjection which is often translated as "OK". Learn more about the difference between "si" and "OK" below.
si(
see
)A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
OK(
oh
-
key
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
