Quick answer
"I'm" is a contraction which is often translated as "soy", and "hi" is an interjection which is often translated as "hola". Learn more about the difference between "I'm" and "hi" below.
I'm(
aym
)A contraction is a shortened form of a word or group of words made by omitting a sound or letter (e.g. don't).
contraction
hi(
hay
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
1. (greeting)
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)