vs 

QUICK ANSWER
"Quién" is a form of "quién", a pronoun which is often translated as "who". "Cuándo" is a form of "cuándo", an adverb which is often translated as "when". Learn more about the difference between "quién" and "cuándo" below.
quién(
kyehn
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. who
¿Quién preparó la cena? ¡Está deliciosa!Who made dinner? It's delicious!
b. whom
¿Quién conoces en esta fiesta?Whom do you know at this party?
a. who
A ver, dime quién te lo dijo.Come on, tell me who told you.
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cuándo(
kwahn
-
doh
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. when
¿Cuándo vas a terminar tus deberes?When are you going to finish your homework?
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. when
Nos vamos a casar, pero el cuándo y el dónde aún no lo sé.We are getting married, but I don't know when or where yet.
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