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QUICK ANSWER
"OK" is an interjection which is often translated as "OK", and "muchas gracias" is a phrase which is often translated as "thank you very much". Learn more about the difference between "OK" and "muchas gracias" below.
OK(
oh
-
key
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
muchas gracias(
moo
-
chahs
grah
-
syahs
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
b. thanks a lot
Muchas gracias por llevarme al aeropuerto.Thanks a lot for taking me to the airport.