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QUICK ANSWER
"Hi" is a form of "hi", an interjection which is often translated as "hola". "What's up" is a form of "what's up", a phrase which is often translated as "qué tal". Learn more about the difference between "hi" and "what's up" below.
hi(
hay
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
1. (colloquial) (salutation)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
what's up(
wuhts
uhp
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (colloquial) (used in questions)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
d. qué onda (colloquial) (Latin America)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
Good morning, Fred! What's up?¡Buenos días, Fred! ¿Qué onda?
a. lo que pasa
They bought a new house. That's what's up with them.Compraron una casa nueva. Eso es lo que pasa con ellos.
