vs 

QUICK ANSWER
"Hello" is a form of "hello", an interjection which is often translated as "hola". "Who is this?" is a phrase which is often translated as "¿Quién es?". Learn more about the difference between "hello" and "Who is this?" below.
hello(
heh
-
lo
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. hola
Hello! How is everything?¡Hola! ¿Cómo te va todo?
a.
Hello. Who is calling?Sí. ¿Quién es?
b. hola
Hello. - Hi, it's Ricardo.Hola. - Hola, soy Ricardo.
c. diga
Regionalism used in Spain
(Spain)
Hello. - Hi. Is Maria there?Diga. - Hola. ¿Se encuentra María?
d. aló
Regionalism used in Ecuador
(Ecuador)
Regionalism used in Panama
(Panama)
(Southern Cone)
Hello. Who is this?Aló. ¿Quién es?
e. bueno
Regionalism used in Mexico
(Mexico)
Hello? I can't hear you.¿Bueno? No te escucho.
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Who is this?(
hu
 
ihz
 
thihs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. ¿Quién es?
Hello, who is this? I just missed a call from this number.Hola, ¿quién es? Acabo de perder una llamada de este número.
b. ¿Quién habla?
Who is this? - It's me, Mom. Don't you recognize my voice?¿Quién habla? - Soy yo, mamá. ¿No me reconoces la voz?
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