QUICK ANSWER
"A dónde" is a phrase which is often translated as "where", and "dónde" is an adverb which is also often translated as "where". Learn more about the difference between "a dónde" and "dónde" below.
a dónde(
ah
dohn
-
deh
)A phrase is a group of words commonly used together (e.g once upon a time).
1. (in questions)
2. (in statements)
a. where
Marga no ha querido decirme a dónde va. - Tiene una cita con un chico que conoció en Internet.Marga wouldn't tell me where she's going. - She has a date with a guy she met on the Internet.
b. where to
Sé que tengo que llevar esta paquete a algún sitio, pero todavía no me han dicho a dónde.I know I have to take this parcel somewhere, but they haven't yet told me where to.
dónde(
dohn
-
deh
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (in questions)
a. where
¿Dónde quieren construir el edificio los arquitectos?Where do the architects want to build the building?
2. (colloquial) (in questions) (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.
a. how
¿Dónde iba a saber que cambiaste de opinión si no me lo dijiste?How was I to know that you'd changed your mind if you didn't tell me?