vs
QUICK ANSWER
"Hola" is a form of "hola", an interjection which is often translated as "hello". "Soy yo" is a phrase which is often translated as "it's me". Learn more about the difference between "hola" and "soy yo" below.
hola
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
1. (general)
b. hi (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Hola! ¿Qué hay de nuevo?Hi! What's new?