Preposition is a word that indicates the relation of a substantive to a verb, an adjective, or another substantive.
A preposition introduces a noun or pronoun or a phrase or clause functioning in the sentence as a noun. The word or word group that the preposition introduces is its object.
A preposition describes a relationship between other words in a sentence.When you try to define a preposition like "in" or "between" or "on," you intend to show how something is situated in relationship to something else.