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Prepositional phrases are phrases that consist of a preposition and an object of the preposition. The object of the preposition can be found after the preposition. Prepositional phrases can function as an adjective or an adverb.

Meet me at the park near the mall. (Adjective since it describes the word park).
I'm going down the hill. (Adverb since it describes the word going).
A prepositional phrase will function as an adjective or adverb. As an adjective, the prepositional phrase will answer the question Which one?
Read these examples:The book on the bathroom floor is swollen from shower steam.