Quick answer
"Who is this?" is a phrase which is often translated as "¿Quién es?", and "hello" is an interjection which is often translated as "hola". Learn more about the difference between "Who is this?" and "hello" below.
Who is this?(
hu
 
ihz
 
thihs
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (general)
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.
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hello(
heh
-
lo
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
1. (greeting)
a. hola
Hello! How is everything?¡Hola! ¿Cómo te va todo?
2. (used to answer the telephone)
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 (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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