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"Despacio" is a form of "despacio", an adverb which is often translated as "slowly". "Por favor" is a phrase which is often translated as "please". Learn more about the difference between "por favor" and "despacio" below.
por favor(
pohr
fah
-
bohr
)A phrase is a group of words commonly used together (e.g., once upon a time).
despacio(
dehs
-
pah
-
syoh
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
2. (not loudly)
3. (not rough)
a. gently
Le golpeó despacio el hombro para advertirle.She tapped gently on his shoulder to warn him.