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"Detrás" is an adverb which is often translated as "behind", and "al lado" is a phrase which is often translated as "nearby". Learn more about the difference between "detrás" and "al lado" below.
detrás(
deh
-
trahs
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
2. (following)
al lado(
ahl
lah
-
doh
)A phrase is a group of words commonly used together (e.g., once upon a time).