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QUICK ANSWER
"Quién" is a pronoun which is often translated as "who", and "quiénes" is a pronoun which is also often translated as "who". Learn more about the difference between "quién" and "quiénes" below.
quién()
A pronoun is a word that stands in for a noun (e.g., she).
quiénes()
A pronoun is a word that stands in for a noun (e.g., she).
