A "prepositional" phrase is a group of words that begins with a preposition and ends with a noun or pronoun, known as the object of the preposition. Prepositions are words like in, on, at, by, and with that show relationships between different elements in a sentence. For example, in the phrase "on the table," "on" is the preposition, and "the table" is the object. Prepositional phrases can provide important details about time, location, direction, and more. They help clarify the meaning of a sentence by adding context. For instance, in the sentence "The cat is under the bed," the prepositional phrase "under the bed" tells us where the cat is located.