A preposition is a term that indicates the link between a noun or pronoun and the other parts of a sentence. It refers to direction, location, time, cause, manner, or possession. Common prepositions include in, on, at, by, with, about, and beneath. For example, in the sentence "The book is on the table," the preposition "on" indicates location. Prepositions frequently appear in phrases like "in front of" or "next to," giving clarity and detail. They help to arrange phrases efficiently, making communication more accurate. Understanding prepositions improves sentence flow and meaning, which benefits both writing and speaking.