Define A Prepositional Phrase. This answers a 'where' question. Prepositional phrases are important for communicating what types of actions and interactions occur between the subjects and objects of sentences.
A prepositional phrase is a group of words consisting of a preposition, its object, and any words that modify the object. It is a word that connects two phrases or ideas in a sentence. Often times, the object will have a modifier or modifiers (such as adjectives, noun adjuncts, etc.) that appear between it and the preposition.