An adverbial phrase is a group of words that act as an adverb, modifying a verb, adjective, or another adverb. These phrases often include adverbs and can provide information about how, when, where, or why something happens.
A preposition is a word that shows the relationship between a noun (or pronoun) and other words in a sentence. Prepositions often indicate relationships of time, place, direction, cause, manner, and other abstract or physical connections